Bromodomain and extra-terminal protein inhibitor combination therapy

ABSTRACT

The present disclosure relates generally to compositions and methods of treating neoplastic diseases or cancers, such as glioblastoma and non-Hodgkin&#39;s lymphomas, or other cancers in which the subject suffers from an advanced solid tumor, comprising a combination of, or administering a combination of, a bromodomain and extra-terminal protein (BET) inhibitor and at least one chemotherapeutic agent, which does not inhibit BET directly. The BET inhibitor/chemotherapeutic agent combination, or combination therapy, can yield synergistic effects, thereby increasing the effectiveness of the cancer treatment as compared with the administration of either the BET inhibitor or the chemotherapeutic agent alone.

CROSS REFERENCE

This Application is a continuation of U.S. patent application Ser. No.15/796,571, filed Oct. 27, 2017, which claims priority benefit of U.S.Provisional Application No. 62/413,763, filed Oct. 27, 2016, and U.S.Provisional Application No. 62/560,840, filed Sep. 20, 2017, thecontents of which are hereby incorporated by reference in theirentireties.

FIELD

The embodiments described herein provide compositions, formulations, andmethods for treating cancer and neoplastic disease; in which suchtreatments include combination therapies comprising administration of abromodomain and extra-terminal (BET) protein inhibitor and achemotherapeutic agent, such as temozolomide or paclitaxel.

BACKGROUND

There remains a need for compositions, formulations, and methods fortreating subjects with cancers such as, for example, basal cellcarcinoma, relapsed or refractory non-Hodgkin's lymphomas (NHL),glioblastoma multiforme, anaplastic astrocytoma, or other advanced solidtumors.

For example, basal cell carcinoma (BCC) is a common cancer throughoutthe world, and its incidence is increasing. In the United States alone,more than 3.5 million new patients are diagnosed annually withnon-melanoma skin cancer. Most BCCs can be cured by topical therapy,surgery, radiotherapy, or a combination thereof. Advanced BCC, however,often causes significant disfigurement and morbidity with associatedphysical and psychological sequelae, because BCC occurs commonly insun-exposed areas such as the face. Further, a small proportion of thesecancers are metastatic and not amenable to typical therapy. Near allBCCs are associated with aberrant hedgehog (Hh) signaling, whichstimulates unregulated cell growth, and several therapeutic Hhinhibitors have proved useful in treating BCC. Unfortunately, about 20%of BCCs develop resistance to current Hh inhibitors, usually via Hhpathway reactivation by mutations that either interfere with the drugbinding pocket, increase Hh signaling activity, or act throughconcurrent copy number changes in suppressor genes. Patients willbenefit from the development of well-tolerated agents that overcomethese resistance pathways by, for example, targeting proteins downstreamin relevant signaling pathways.

SUMMARY

The aspects and embodiments of the present disclosure provide formethods and pharmaceutical compositions for treating subjects withcancer and neoplastic disease; such as those with advanced solid tumors,relapsed or refractory non-Hodgkin's lymphomas, glioblastoma multiforme,anaplastic astrocytoma, basal cell carcinoma, or other cancers. At leastone embodiment provides a method for treating cancer and neoplasticdisease comprising administering to a subject in need thereof atherapeutically effective amount of at least one BET inhibitor and atherapeutically effective amount of at least one chemotherapeutic agent.The chemotherapeutic agent may be an alkylating agent, such astemozolomide, or a mitotic inhibitor such as paclitaxel or paclitaxelprotein-bound particles. An exemplary BET inhibitor is4-[2(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2-methylisoquinolin-1-one.According to the method, administration of a BET inhibitor andchemotherapeutic agent may be concurrent or sequential.

In at least one embodiment, a BET inhibitor and chemotherapeutic agentof the combination therapy may be administered in a singlepharmaceutical composition. Some embodiments provide a compositioncomprising a pharmaceutically effective amount of a BET inhibitor andtemozolomide, formulated in a pharmaceutically acceptable carrier. Someembodiments provide a composition comprising a pharmaceuticallyeffective amount of a BET inhibitor and protein-bound paclitaxel,formulated in a pharmaceutically acceptable carrier. In one embodiment,BET inhibitor and chemotherapeutic agent of the combination therapy mayexist as separate pharmaceutical compositions administered eitherconcurrently or sequentially. In another embodiment, BET inhibitor andchemotherapeutic agent are independent pharmaceutical compositions thatare admixed before administration (i.e., admixed in a pharmaceuticallyacceptable solution for injection or infusion). In still anotherembodiment, BET inhibitor and chemotherapeutic agent are disposed asseparate pharmaceutical compositions that are packaged together foradministration (e.g., a blister-pack containing oral formulations, orpackaging comprising an oral dosage form and an injectable dosage form).

In at least one embodiment, administering the BET inhibitor and thechemotherapeutic agent results in a synergistic inhibition of cellproliferation or increased cell death (e.g., tumor cell death) comparedwith administration of either the BET inhibitor or the chemotherapeuticagent alone. The chemotherapeutic agent can be an anti-proliferative orproapoptotic compound, and can be selected so as to show a synergisticanti-proliferative or proapoptotic effect when co-administered with aBET inhibitor.

Combinatorial treatment with a BET inhibitor and a chemotherapeuticagent can result in a synergistic anti-cancer effect or can overcomedeveloped resistance. Synergistic effects or overcoming developedresistance can allow lower doses, significantly reducing therapy cost ina substantial patient population.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph showing dose-dependent tumor growth inhibition asmeasured by tumor volume in a TNBC PDX model, COH70, following dosingwith Compound A(4-[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2-methylisoquinolin-1-one).Compound A dosing by mouth (PO) once daily for 3 consecutive days,followed by 4 days off (3×/week); - Vehicle; - - - - Compound A 12.5mg/kg PO 3×/week; - - Compound A 16 mg/kg PO 3×/week; - - - Compound A20 mg/kg PO 3×/week; SEM is the standard error of the mean.

FIG. 2 is a graph showing dose-dependent tumor growth inhibition asmeasured by tumor volume in a GBM PDX model, GBM15, following dosingwith Compound A. - Vehicle; - - - Compound A 15 mg/kg PO once daily for5 consecutive days, followed by 2 days off (5/2); - - Compound A 25mg/kg PO once daily for 3 consecutive days, followed by 4 days off(3/4); - - - - Compound A 37.5 mg/kg PO once daily for 2 consecutivedays, followed by 5 days off (2/5); SEM is the standard error of themean.

FIG. 3 is a graph showing tumor growth inhibition of GBM3 (GBM PDX)xenografts by administration of either Compound A, temozolomide (TMZ),or a combination of Compound A and TMZ. - Vehicle; - - - - Compound A 12mg/kg PO once daily; - - - - Compound A 6 mg/kg PO twice daily; - -Compound A 6 mg/kg PO twice daily combined with TMZ 50 mg/kg IP(intraperitoneal injection) given on days 7-9 and 22-24; - - - TMZ 50mg/kg IP given on days 7-9, 22-24; SEM is the standard error of themean.

FIG. 4 is a schematic outlining an overall study design useful fordemonstrating safety or efficacy of pharmaceutical compositions.

FIG. 5 relates the probability of dose-limiting toxicity (DLT) accordingto prior distribution. □ SE; ∘ SM; Δ SL; + FM; x FL.

FIG. 6 shows dose toxicity curves useful for simulation.

FIG. 7 is a scheme showing published recommendations for management oftreatment-induced diarrhea (Benson et al., 22 J. Clin. Oncol. 2918(2004)), modified for consistency with a study protocol.

FIG. 8 is a graph showing tumor growth inhibition of PA0165 xenograftsby administration of either Compound A, Romidepsin, or a combination ofCompound A and Romidepsin. 3/4 is 3 days on and 4 days off; Q4D is onceevery 4 days; Q7D is once every 7 days; - Control; - - - - Compound A 25mg/kg, 3/4; - - - Romidepsin 1.5 mg/kg Q4Dx3; - - Compound A 25 mg/kg,3/4 combined with Romidepsin 1.5 mg/kg Q7D; - - - Compound A 25 mg/kg,3/4 combined with Romidepsin 0.75 mg/kg Q7D. Tumor volumes were plottedas mean±standard error of the mean (SEM).

FIG. 9 is a graph showing survival curve of PA0165 xenografts byadministration of either Compound A, Romidepsin, or a combination ofCompound A and Romidepsin. 3/4 is 3 days on and 4 days off; Q4D is onceevery 4 days. - Control; - - - - Compound A at 25 mg/kg, 3/4; - - -Romidepsin 1.5 mg/kg Q4Dx3; - - Compound A 25 mg/kg, 3/4 combined withRomidepsin 1.5 mg/kg Q7D; - - - Compound A 25 mg/kg, 3/4 combined withRomidepsin 0.75 mg/kg Q7D.

FIG. 10 is a graph showing tumor growth inhibition of PA0165 xenograftsby administration of either Compound A, Abraxane, or a combination ofCompound A and Abraxane. - Control; - - - - Compound A 25 mg/kg; - - -Abraxane 10 mg/kg; - - Compound A 25 mg/kg combined with Abraxane 10mg/kg; - - - Compound A 12.5 mg/kg combined with Abraxane 10 mg/kg.Tumor volumes were plotted as mean±standard error of the mean (SEM).

FIG. 11 is a graph showing survival curve of PA0165 xenografts byadministration of either Compound A, Abraxane, or a combination ofCompound A and Abraxane. - Control; - - - - Compound A 25 mg/kg; - - -Abraxane 10 mg/kg; - - Compound A 25 mg/kg combined with Abraxane 10mg/kg; - - - Compound A 12.5 mg/kg combined with Abraxane 10 mg/kg.

DETAILED DESCRIPTION

It should be understood that this invention is not limited to theparticular methodology, protocols, and reagents, etc., described hereinand as such may vary. The terminology used herein is for the purpose ofdescribing particular embodiments only, and is not intended to limit thescope of the present invention, which is defined solely by the claims.

As used herein and in the claims, the singular forms “a,” “an,” and“the” include the plural reference unless the context clearly indicatesotherwise. The term “or” is inclusive unless modified, for example, by“either.” Other than in the operating examples, or where otherwiseindicated, all numbers expressing quantities of ingredients or reactionconditions used herein should be understood as modified in all instancesby the term “about.” The term “about” when used in connection withpercentages may mean±1%. Unless defined otherwise, all technical andscientific terms used herein have the same meaning as those commonlyunderstood to one of ordinary skill in the art to which this inventionpertains.

All patents and other publications identified are incorporated herein byreference for the purpose of describing and disclosing, for example, themethodologies described in such publications that might be used inconnection with the present invention, but are not to providedefinitions of terms inconsistent with those presented herein. Thesepublications are provided solely for their disclosure prior to thefiling date of the present application. Nothing in this regard should beconstrued as an admission that the inventors are not entitled toantedate such disclosure by virtue of prior invention or for any otherreason. All statements as to the date or representation as to thecontents of these documents is based on information available to theapplicants and do not constitute any admission as to the correctness ofthe dates or contents of these documents.

At least one embodiment provides for a method of treating cancer with acombination therapy comprising administration of an in inhibitor of abromodomain and extraterminal (BET) protein and a chemotherapeuticagent. For example, the BET inhibitor may be a bromodomain inhibitor,such as4-[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2methylisoquinolin-1-one(Compound A); and the chemotherapeutic agent may be temozolomide(4-methyl-5-oxo-2,3,4,6,8-pentazabicyclo[4.3.0]nona-2,7,9-triene-9-carboxamide),protein bound paclitaxel (e.g., ABRAXANE®), or romidepsin(1S,4S,7Z,10S,16E,21R)-7-ethylidene4,21-diisopropyl-2-oxa-12,13-dithia-5,8,20,23-tetrazabicyclo[8.7.6]tricos-16-ene-3,6,9,19,22pentone).Accordingly, an example embodiment provides combination therapycomprising Compound A and temozolomide. Another example embodimentprovides combination therapy comprising Compound A and protein-boundpaclitaxel. And yet another example embodiment provides combinationtherapy comprising Compound A and romidepsin. As described in moredetail herein, Compound A is a potent and reversible inhibitor of theepigenetic BET proteins. Surprisingly, combination therapy comprisingadministration of a BET inhibitor (e.g., Compound A) and achemotherapeutic agent (e.g., temozolomide, protein bound paclitaxel, orromidepsin) exhibited synergistic therapeutic results.

At least one embodiment provides for treatment of subjects with cancer,particularly advanced solid tumors or relapsed/refractory NHLs,comprising administering a pharmaceutical formulation comprising a BETinhibitor and a chemotherapeutic agent, such as an alkylating agent(temozolomide) or mitotic inhibitor (such as a protein-boundpaclitaxel). For example, the BET inhibitor may be a bromodomaininhibitor such as Compound A. A specific example relates to assessingthe safety, tolerability, pharmacokinetics and preliminary efficacy ofCompound A in human subjects.

The present embodiments provide methods and compositions, such aspharmaceutical formulations that provide therapeutic benefit in thetreatment of cancers, such as advanced solid tumors orrelapsed/refractory NHLs, for example, DLBCL or iNHL. Additionalexamples of cancers associated with solid tumors include fibrosarcoma,myxosarcoma, liposarcoma, chondrosarcoma, osteogenic sarcoma, chordoma,angiosarcoma, endotheliosarcoma, lymph-angiosarcoma,lymphangioendotheliosarcoma, synovioma, mesothelioma, Ewing's tumor,leiomyosarcoma, rhabdomyosarcoma, colon cancer, colorectal cancer,kidney cancer, pancreatic cancer, bone cancer, breast cancer, ovariancancer, prostate cancer, esophageal cancer, stomach cancer, oral cancer,nasal cancer, throat cancer, squamous cell carcinoma, basal cellcarcinoma, adenocarcinoma, sweat gland carcinoma, sebaceous glandcarcinoma, papillary carcinoma, papillary adenocarcinomas,cystadenocarcinoma, medullary carcinoma, bronchogenic carcinoma, renalcell carcinoma, hepatoma, bile duct carcinoma, choriocarcinoma,seminoma, embryonal carcinoma, Wilms' tumor, cervical cancer, uterinecancer, testicular cancer, small cell lung carcinoma, bladder carcinoma,lung cancer, epithelial carcinoma, glioma, glioblastoma multiforme,astrocytoma, medulloblastoma, craniopharyngioma, ependymoma, pinealoma,hemangioblastoma, acoustic neuroma, oligodendroglioma, meningioma, skincancer, melanoma, neuroblastoma, and retinoblastoma.

The terms “subject” or “patient” as used herein refer to any subject,particularly a mammalian subject, for whom diagnosis, prognosis, ortherapy of a cancer, such as a solid tumor or relapsed/refractory NHL(e.g., diffuse large B-cell lymphoma (DLBCL) or indolent NHL (iNHL)) isrelevant. The terms “subject” or “patient” may include any human ornonhuman animal as context indicates.

As used herein the terms “treat,” “palliating,” “ameliorating,”“treatment,” or “treatment of” (e.g., in the phrase “treating a patienthaving an advanced solid tumor or relapsed/refractory NHL) are usedinterchangeably herein and refer, in general, therapeutic benefit orprophylactic benefit, e.g., reducing the potential for disease, reducingthe occurrence of disease, or reducing the severity of disease. Forexample, treating can refer to the ability of a therapy whenadministered to a subject, to prevent further tumor growth ormalignancy, or to cure or to alleviate at least partially a diseasesymptom, sign, or cause. Treating also refers to mitigating ordecreasing at least one clinical symptom or inhibition or delay in theprogression of the condition or prevention or delay of the onset of adisease or illness. Thus, the terms “treat,” “treating.” or “treatmentof” (or grammatically equivalent terms) refer to both prophylactic andtherapeutic treatment regimes. These terms refer to an approach forobtaining beneficial or desired results, including but not limited totherapeutic benefit or a prophylactic benefit. By “therapeutic benefit”is meant eradication or amelioration of the underlying disorder beingtreated. Also, a therapeutic benefit is achieved with the eradication oramelioration of one or more of the physiological symptoms associatedwith the underlying disorder such that an improvement is observed in thepatient, notwithstanding that the patient may still be afflicted withthe underlying disorder. For prophylactic benefit, the compositions maybe administered to a patient at risk of developing a particular disease,or to a patient reporting one or more of the physiological symptoms of adisease, even though a diagnosis of this disease may not have been made.

Accordingly, “therapeutic agent” as used herein refers to anytherapeutically active substance that is administered to a subject toproduce a desired, usually beneficial, effect. The term therapeuticagent includes, e.g., classical low molecular weight therapeutic agentscommonly referred to as small molecule drugs; and biologics including,but not limited to, antibodies or functionally active portions thereof,peptides, lipids, protein drugs, protein conjugate drugs, fusionproteins, enzymes, nucleic acids, ribozymes, genetic material, viruses,bacteria, eukaryotic cells, and vaccines. A therapeutic agent can alsobe a pro-drug. A therapeutic agent can also be a radioactive isotope. Atherapeutic agent can be an agent activated by a form of energy such aslight or ultrasonic energy, or activated by other circulating moleculesthat can be administered systemically or locally. In addition, thetherapeutic agent can be pharmaceutically formulated.

References to “pharmaceutical agent,” “therapeutic agent,”“pharmaceutically active,” “pharmaceutical,” “drug,” “medicament,”“active agent,” “active drug” “active pharmaceutical ingredient,” andthe like, refer in a general sense to substances useful in the medicaland scientific arts, including, for example, drugs, biologics,diagnostic agents (e.g, dyes or contrast agents) or other substancesused for therapeutic, diagnostic, or preventative (e.g., vaccines), orresearch purposes. Example pharmaceutical agents include smallmolecules, chemotherapeutic agents, contrast agents, anesthetics,interfering RNAs, gene vectors, biologics, immunogens, antigens,interferons, polyclonal antibody preparations, monoclonal antibodies,insulins, or combinations of any of these. As noted, a pharmaceuticalcomposition or pharmaceutical formulation may comprise one or moreactive therapeutic agents, or a combination of active and diagnosticagents, etc., typically further comprising a suitable excipient(s).

Inactive” substances refer to carriers, excipients, diluents, and thelike, which are well-known in the art, although such substances may havebeneficial function in the mixed injectable, such as, for example,surfactant, inorganic or organic salt, stabilizer, diluent, solubilizer,reducing agent, antioxidant, chelating agent, preservative, adjuvants,isotonic or buffering agents, or any excipient conventionally used inpharmaceutical compositions (i.e., “pharmaceutically acceptableexcipient”) and the like. These active or inactive substances may alsoinclude substances having immediate, delayed, controlled, or sustainedrelease characteristics.

A “pharmaceutical formulation,” “formulation,” or “pharmaceuticalcomposition” refers to a drug product that includes at least one activeagent and may further include at least one pharmaceutically acceptableexcipient, carrier, buffer, stabilizer, or other material wellknown tothose skilled in the art. For example, a typical injectablepharmaceutical formulation includes a parenterally acceptable aqueoussolution which is pyrogen-free and has suitable pH, isotonicity, andstability. Pharmaceutical compositions can have diagnostic, therapeutic,or research utility in various species, such as for example in humanpatients or subjects. In at least one embodiment, a pharmaceuticalcomposition comprises a BET inhibitor and a chemotherapeutic agent suchas temozolomide, protein-bound paclitaxel, or romidepsin. For example, aBET inhibitor may be4-[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2methylisoquinolin-1-one(Compound A).

The agents and compositions described herein can be formulated by anyconventional manner using one or more pharmaceutically acceptablecarriers or excipients as described in accepted literature.

-   See, e.g., REMINGTON—Science & Practice of Pharmacy, 22nd edition    (Lloyd, ed., Pharmaceutical Press, London, U K, 2012). Such    formulations contain a therapeutically effective amount of an active    agent(s) described herein, preferably in purified form, together    with a suitable amount of carrier so as to provide the form for    proper administration to the subject.

“Prodrug” is meant to indicate a compound that may be converted underphysiological conditions or by solvolysis to a biologically activecompound described herein. Thus, the term “prodrug” refers to aprecursor of a biologically active compound that is pharmaceuticallyacceptable. A prodrug may be inactive when administered to a subject,but is converted in vivo to an active compound, for example, byhydrolysis. The prodrug compound often offers advantages of solubility,tissue compatibility or delayed release in a mammalian organism. Theterm “prodrug” is also meant to include any covalently bonded carriers,which release the active compound in vivo when such prodrug isadministered to a mammalian subject. Prodrugs of an active compound maybe prepared by modifying functional groups present in the activecompound in such a way that the modifications are cleaved, either inroutine manipulation or in vivo, to the parent active compound.

Prodrugs include compounds wherein a hydroxy, amino or mercapto group isbonded to any group that, when the prodrug of the active compound isadministered to a mammalian subject, cleaves to form a free hydroxy,free amino, or free mercapto group. Examples of prodrugs include, butare not limited to, acetate, formate and benzoate derivatives of alcoholor amine functional groups in active compounds. See, e.g., DESIGN OFPRODRUGS, at 7-9, 21-24 (Bundgaard, Ed., Elsevier, Amsterdam, 1985). Forexample, temozolomide is an imidazotetrazine derivative prodrug of thealkylating agent dacarbazine.

A pharmaceutical formulation can include a therapeutically effectiveamount of at least one active agent. Such effective amounts can bereadily determined by one of ordinary skill in the art based, in part,on the effect of the administered dosage form, or the combinatorialeffect of an agent and one or more additional active agents, if morethan one agent is used. A therapeutically effective amount of an activeagent can also vary according to factors such as the disease state, age,sex, and weight of the individual, and the ability of the agent (and oneor more additional active agents) to elicit a desired response in theindividual, e.g., amelioration of at least one condition parameter. Forexample, a therapeutically effective amount of a dosage form can inhibit(lessen the severity of or eliminate the occurrence of), prevent aparticular disorder, or lessen any one of the symptoms of a particulardisorder known in the art or described herein. A therapeuticallyeffective amount may also be one in which any toxic or detrimentaleffects of the active agent or dosage form are outweighed by thetherapeutically beneficial effects.

Accordingly, an active agent can be administered to a subject as amonotherapy, or as a combination therapy with another active agent in acombination dosage form, or as an additional treatment, e.g., anothertreatment for the same, an associated, or an additional disorder. Forexample, a BET inhibitor can be combined with a chemotherapeutic agent,such as temozolomide or protein-bound paclitaxel, in the sameformulation, or in a different formulation administered simultaneouslyor sequentially. Additionally, combination therapy can includeadministering to the subject (e.g., a human patient) one or more agents(e.g., antibiotics, anticoagulants, anti-hypertensives, oranti-inflammatory drugs) that provide a therapeutic benefit to subject.In another example, combination therapy can include administering to thesubject a BET inhibitor, temozolomide, or a combination comprising a BETinhibitor and temozolomide, and one or more additional agents thatprovide therapeutic benefit to a subject who has cancer, such as anadvanced solid tumor or relapsed/refractory NHL. Similarly, in anotherexample, combination therapy can include administering to the subject aBET inhibitor, protein-bound paclitaxel, or a combination comprising aBET inhibitor and paclitaxel, and one or more additional agents thatprovide therapeutic benefit to a subject who has cancer. Similarly, inyet another example, combination therapy can include administering tothe subject a BET inhibitor, romidepsin, or a combination comprising aBET inhibitor and romidepsin, and one or more additional agents thatprovide therapeutic benefit to a subject who has cancer. In someembodiments, an active agent and one or more additional active agentsare administered in a single dosage form, e.g., a pharmaceuticalcomposition comprising a BET inhibitor and temozolomide, paclitaxel orromidepsin. In other embodiments, an active agent is administered firstin time and an additional active agent(s) is administered second intime. In some embodiments, one or more additional active agents areadministered at the same time, but using different drug delivery devicesor delivery modes, for example, providing for combination therapycomprising administration of a BET inhibitor and temozolomide, orcomprising a BET inhibitor and paclitaxel, or comprising a BET inhibitorand romidepsin. In at least one embodiment, the BET inhibitor is4-[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2methylisoquinolin-1-one(Compound A).

The administration of a BET inhibitor, or both a BET inhibitor andchemotherapeutic agent as combination therapy described herein, mayreplace or augment a previously or currently administered therapy. Forexample, upon treating with one pharmaceutical formulation,administration of an additional active agent(s) can cease or bediminished, e.g., be administered at lower concentrations or with longerintervals between administrations. In some embodiments, administrationof a previous therapy can be maintained. In some embodiments, a previoustherapy is maintained until the level of an active agent reaches a levelsufficient to provide a therapeutic effect. Accordingly, two therapiescan be administered in combination, sequentially, or simultaneously.

In at least one embodiment, combination therapy comprising theadministration of a BET inhibitor and a chemotherapeutic agent has anadditive effect in comparison with therapy administration comprisingeither BET inhibitor or chemotherapeutic agent alone. In otherembodiments, the administration of a BET inhibitor and achemotherapeutic agent in combination therapy has a synergistic effectin comparison with therapy administration comprising either BETinhibitor or chemotherapeutic agent alone. In some embodiments,combination therapy comprising the administration of a BET inhibitor anda chemotherapeutic agent reduces side effects in comparison with therapyadministration comprising either BET inhibitor or chemotherapeutic agentalone or administration of the one or more other agents alone. Forexample, a combined therapy comprising administration of Compound A andtemozolomide, paclitaxel or romidepsin resulted in a synergistictherapeutic result.

A therapeutic benefit is not necessarily a cure for a particular cancer(e.g., advanced solid tumor or relapsed/refractory NHL), but ratherencompasses a result that most typically includes alleviation; increasedsurvival; elimination of a tumor; reduction of a symptom associated witha cancer; prevention or alleviation of a secondary disease, disorder, orcondition resulting from the occurrence of a cancer; or prevention ofmetastasis. Advanced solid tumors include unresectable solid tumors.Relapsed or refractory NHLs include DLBCL and iNHL.

In at least one embodiment described herein, the disease state of thetreated subject (e.g., advanced solid tumor or relapsed/refractory NHL)is associated with epigenetics or the epigenetic state of the subject.Epigenetics refers, in general, to cellular and physiological phenotypictrait variations in which external or environmental factors affectgenetic expression, rather than affecting changes in a DNA sequence perse. In other words, unlike genetics based on changes to the DNA sequence(the genotype) changes in gene expression or cellular phenotype ofepigenetics have other causes. For example, DNA methylation andposttranslational modifications of the nucleosome histone proteinsalters chromatin organization and gene expression without altering theunderlying DNA sequence. Thus, epigenetic modification may influence if,when, or where specific genes are expressed, permitting a cell toregulate differential gene expression both reversibly and selectively.Chaidos et al., 6 Ther. Adv. Hematol. 128 (2015). Epigeneticmodification is a dynamic and reversible process written, erased, andread by families of enzymes: ‘writers’ covalently attach acetyl ormethyl groups; ‘erasers’ remove these groups; and ‘readers’ recognizeand bind to these groups. Arrowsmith et al., 11 Nature Rev. Drug Discov.384 (2012).

Initiation and progression of cancer has increasingly been linked tomisreading, miswriting or miserasing of these modifications. Chi et al.,10 Nature Rev. Cancer 457 (2010).

Bromodomain and extra-terminal (BET) proteins are a group of epigenetic‘readers’ that play a pivotal role in the epigenetic process, and indeedmay control expression of genes involved in cell growth and oncogenesis.Wyce, 4 Oncotarget 2419 (2013a). The posttranslational acetylation ofnucleosome histone N-terminal tails represents the fundamentalepigenetic mark of open structure chromatin and active genetranscription. Members of the BET protein family feature highlyhomologous, tandem bromodomains (BD-1 and BD-2) that recognize and bindthese acetylated lysine histone tails. The BET proteins then act asscaffolds that recruit transcription factors and chromatin organizerswhich are required for transcription. For example, via a set ofhydrogen-bonding interactions between highly conserved asparagine andtyrosine residues and the acetylated lysine, the BET bromodomains linkchromatin to the CDK9-containing complex P-TEFb, which phosphorylatesthe large subunit of RNA Polymerase II and facilitates pause release andtranscript elongation. Chaidos et al., 2015.

The BET family includes four members: BRD2, BRD3, BRD4, and BRDT. Dawsonet al., New Engl. J. Med. 367 (2012); Jenuwein & Allis, 293 Science 1074(2001). BRDT is found exclusively in germ cells, but BRD2, BRD3, andBRD4 are ubiquitous in germ and somatic cells. Chaidos et al., 2015.BRD4 (bromodomain containing protein-4) acts as a transcriptionalco-regulator that binds to ε-N-lysine acetylation pockets on the tailsof histones H3 and H4; where it can regulate gene expression throughrecruitment of additional proteins to its chromatin binding sites,thereby affecting chromatin structure and function. Jacobson et al., 288Science 1422 (2000). Additionally, BRD4 binds preferentially athyperacetylated super enhancer promoter regions and regulatestranscription of target genes by recruiting co-activator or co-expressorcomplexes. Jung et al., 12 J. Neuroinflammation 1 (2015); Junwei &Vakoc, 54 Molec. Cell 728 (2014); Jenuwein & Allis, 2001.

Additionally, BET protein deregulation has been observed in severaltumorous diseases. For example, a rare aggressive epithelial tumor(nuclear protein in testis (NUT)), is driven by fusions of the NUTprotein with BRD3 or BRD4; and BET inhibitors have shown preclinicalactivity in this tumor. Filippakopoulos & Knapp, 2010; French, 203Cancer Genet. & Cytogen. 16 (2010). BRD4 deregulation also occurs inleukemia, hepatocellular carcinoma, and breast cancers. Zuber et al.,478 Nature 524 (2011); Li et al., 7 Oncotarg. 2462 (2015). Further,overexpression of BRD2 and BRD4 has been demonstrated in glioblastomacells, and BET inhibition by I-BET-151 (GSK1210151A) showed activity inglioblastoma multiforme (GBM) xenografts, comparable to temozolomide.Pastori et al., 9 Epigen. 611 (2014). Separately, BET inhibitionsuppressed the oncogenic transcription factor FOSL1 and its targets in alung adenocarcinoma cell line. Lockwood et al., 109 PNAS 19408 (2012).

BRD4 has also been shown to control expression of genes involved in cellgrowth and oncogenesis, such as MYC, FOSL1, and GLI. Shi et al., 25Cancer Cell 210 (2014); Filippakopoulos & Knapp, 13 Nat. Rev. 337(2014). BRD-containing complexes binding at super-enhancer sites oftenlocalize to promoter regions of key transcription factors, such as theoncogene c-MYC, which is activated in nearly 70% of all cancers. Nilsson& Cleveland 22 Oncogene 9007 (2003); Whyte et al., 153 Cell 307 (2013);Lov6n et al. 153 Cell 320 (2013). BET inhibitors disrupt thesecomplexes, down regulate MYC and have shown activity in human tumorxenografts of MYC-driven hematologic and solid tumors. Mertz et al., 108PNAS 16669 (2011); Puissant et al., 3 Canc. Discov. 308 (2013);Shimamura et al., 19 Clin. Canc. Res. 6183 (2013); Wyce et al., 8 PLoSOne e72967 (2013b); Bandopadhayay et al., 20 Clin. Cancer Res. 912(2014); Hu et al. 16 Int. J. Mol. Sci. 1928 (2015); Li et al., 2015;Mazur et al., 21 Nat. Med. 116 (2015). Moreover, activity has been seenin clinical trials of a BET inhibitor in refractory/resistant lymphomaand leukemia. Dombret et al., ASH 2014, Abstract 117. BRD4, therefore,may have a role in the transcription of many genes, and the inhibitionof BRD4 can potentially down regulate these transcribed genes, includinggenes implicated in drug resistance such as drug pumps/Examples of genesinvolved in cancer drug/therapy resistance are multidrug resistance(P-Glycoprotein, MDR1), multidrug transporter protein (MRP1, ABCC1),breast cancer resistance protein (BCRP, MXR, ABCG2) and glutathione(GSH).

BET proteins also appear to have a role in epithelial-mesenchymaltransition (EMT) and development of cancer stem cells (CSCs).Epithelial-mesenchymal transition is associated with progression andmetastasis of many carcinomas, and there appears to be a correlationbetween EMT, chemo-resistance and emergence of CSCs. Thiery, 2 Nat. Rev.Cancer 442 (2002); Thiery, 15 Curr. Opin. Cell Biol. 740 (2003); Huberet al., 17 Curr. Opin. Cell Biol. 548 (2005); Mani et al., 133 Cell 704(2008); Castellanos et al., 6 OncoTargets Ther. 1261 (2013); Satoh etal., 50 J. Gastroenterol. 140 (2015). CSC have unrestrainedproliferation and can self-renew, differentiate into other cell types,and form tumors in immunodeficient mice. Castellanos et al., 2013.Indeed, CSC may be responsible for tumor initiation, progression,recurrence and metastasis, as well as tumor heterogeneity and resistanceto treatment. Sheridan et al., 8 Breast Canc. Res. R59 (2006); Campbell& Polyak, 6 Cell Cycle 2332 (2007); Li et al., 100 J. Natl. Cancer Inst.672 (2008); Zhu et al., 32 Clin. Translat. Med. 1 (2014); Dawood et al.,28 Oncol. J. 1101 (2014). CSCs have been identified in leukemias, breast(particularly basal-like breast cancer), colon, GBM, head and neck,hepatic, lung, melanoma, pancreas and prostate carcinomas. Fang et al.,65 Canc. Res 9328 (2005); Ma et al., 132 Gastroenterol. 2542 (2007);Tang et al., 21 FASEB J. 3777 (2007); Eppert et al., 17 Nature Med. 1086(2011); Lathia et al., 29 Genes & Devel. 120 (2015).

Further regarding EMT, the Twist transcription factor has beenidentified as a key activator of EMT. Wu & Donohoe, 2 RNA Dis. 1 (2016).Twist exists in high levels in both aggressive pancreatic cancer cellswith high metastatic potential, and breast cancer CSCs. Mani et al.,2008; Von Burstin et al., 137 Gastroenterol. 361 (2009). Importantly,BRD4 binds to Twist and this Twist/BRD4 interaction invokestumorigenicity and invasion in BLBC. Shi, (2014). BET inhibitors canblock this Twist-BRD4 interaction, however, and inhibit growth in abasal-like breast cancer xenograft model. Work in colorectal carcinomasupports BRD4's key role in EMT: the BRD4 inhibitor, MS417, inhibitedcolon cell proliferation, migration, and invasion; impaired growth in aCRC xenograft model; and suppressed development of liver metastases. Huet al., 16 Intl. J. Mol. Sci. 1928 (2015).

Furthermore, BET proteins are critical regulators of the Hedgehog (Hh)pathway, which is activated in CSCs. Varnat et al., 1 EMBO Mol. Med. 338(2009); Amakye, 19 Nature Med. 1410 (2013); Tang et al., 2014; Infanteet al., 36 Trends Pharma. Sci. 54 (2015). The Hh pathway is a keyregulator of cell growth and differentiation during embryogenesis but isnormally inactive in adult tissues. Ingham & McMahon, 15 Genes Devel.3059 (2001); Von Hoff et al., 361 New Engl. J. Med. 1164 (2009).Aberrant activation of this pathway is implicated in tumorigenesis ofvarious cancers such as medulloblastoma, rhabdomyosarcoma, and almostall BCCs. Xie et al., 391 Nature 90 (1998); Epstein, 8 Nature Rev. 743(2008); Teglund & Toftgard, 1805 Biochim. Biophys. Acta 181 (2010). Hhligand over-expression has also been observed in breast, colorectal,esophageal, lung, gastric, pancreatic, and prostate tumors. Teglund &Toftgard, 2010.

Additionally, aberrant Hh pathway signaling activates the Smoothenedreceptor (SMO) which, in turn, up-regulates glioma-associated oncogenehomolog 1 (GLI1) transcriptional activity. GLI transcription isotherwise independent of Hh signaling, being driven by tumor growthfactor-beta and KRAS. GLI1-driven transcription contributes to pancreascancer progression. Nolan-Stevaux et al., 23 Genes Devel. 24 (2009).BRD4 and other BET proteins regulate GLI1 transcription downstream ofSMO. In particular, BRD4 directly occupies GLI1 and GLI2 promoters. Tanget al., 20 Nature 732 (2014). This occupancy can be inhibited by BETinhibitors, thus offering a target in Hh-driven tumors regardless ofdependence on activation by SMO. Of note, the BET inhibitor, JQ1,decreased tumor cell proliferation in vitro and in vivo in Hh-driventumors, including tumors resistant to SMO antagonists. Tang et al.,2014. Another BET inhibitor, I-BET-151, suppressed Hh-dependent growthof medulloblastoma in vitro and in vivo, and suppressed SMO-independentactivation of the Hh pathway in vitro. Long et al., 289 J. Biol. Chem.(2014). Aberrant Hh signaling also occurs in 95% of basal cellcarcinomas (BCC). Migden et al., 16 Lancet Oncol. 716 (2015).

BCC is a common cancer throughout the world, and its incidence isincreasing. Rubin, 353 New Engl. J. Med. 2262 (2005); Am. Cancer. Soc.,Skin Cancer Facts, via ACS website, 2015. An estimated two to threemillion non-melanoma skin cancers occur globally each year, andapproximately 80% are BCCs. World Health Organization, Ultravioletradiation & the INTERSUN Programme, website, (2015); ACS, 2015. This islikely an underestimate because in the United States, where the registryis better documented than most countries, it is estimated that more than3.5 million new patients are diagnosed with non-melanoma skin cancerannually. Furthermore, the incidence in Europe is increasing by 1 per100,000 per annum. ACS, 2015; Rubin et al., 2005; Lomas et al., 166 Br.J. Dermatol. 1069 (2012).

Most BCCs can be cured by topical therapy, surgery or radiotherapy or acombination thereof. NCCN, guidelines; Trakatelli et al., 24 Eur. J.Dermatol. 312 (2014). A small proportion, however, progress to, orpresent with, locally advanced, or in less than 1%, metastatic BCC,which is not amenable to such therapy. Alonso et al., 20 JEADV 735(2006); Danial et al., 169 Br. J. Dermatol. 673 (2013); Sekulic et al.,366 New Engl. J. Med. 2171 (2013); Bassett-Seguin et al., 16 LancetOncol. 729 (2015). Advanced BCC often causes significant disfigurementand morbidity, with associated physical and psychological problems sinceit occurs most commonly in sun-exposed areas, such as the head. Wong etal., 327 Br. J. Med. 794 (2003). Treatment of advanced and metastaticcases was difficult prior to availability of Hh inhibitors.

In BCC, the aberrant Hh signaling pathway is initiated when theextracellular Hh protein binds to the transmembrane receptor Patched(PTCH1) and liberates the SMO transmembrane protein. Ingham, 15 Genes &Devel. 3059 (2001); Rubin et al., 2006. Signaling by SMO mobilizes thenormally latent zinc finger transcription factor GLI2, whichtransactivates the GLI1 promoter. Huangfu & Anderson, 102 PNAS 11325(2005); Haycraft et al., 1 PLoS Genet 48 (2005); Liu et al., 132 Devel.3103 (2005). GLI1 and GLI2 directly activate transcription of Hh targetgenes, including several involved in cell growth, such as MYCN andCCND1. Daya-Grosjean & Couvé-Privat, 225 Cancer Lett. 181 (2005);Scales, 30 Trends Pharma Sci. 303 (2009); Oliver et al., 100 PNAS 7331(2003); Tang et al., 2014. Additionally, GLI1 amplifies Hh signaling byactivating transcription of GLI2 in a positive feedback loop. Regl etal., 21 Oncol. 5529 (2002). Further, mutations of PTCH1 and SMO havebeen identified in basal cell nevus syndrome and sporadic BCCs. Hahn,1996; Gailani, 1996; Unden, 1997; Xie, 1998. In 80-90% of BCC cases,mutations cause loss of function of PTCH1, which normally inhibits thesignaling activity of SMO. Alcedo, 1996; Hahn et al., 85 Cell 841(1996); Johnson et al., 272 Science 1668 (1996); Bassett-Seguin, 2015.Another 10% of BCC cases are due to constitutive activation of SMO. Xie,1998; Bassett-Seguin et al., 16 Lancet Oncol. 729 (2015); Reifenbergeret al., 152 Br. J. Dermatol. 43 (2005). These mutations causeconstitutive Hh pathway signaling and the resultant expression of GLI1in basal cells is associated with development of BCC. Dahmane et al. 389Nature 876 (1997); Von Hoff et al., 361 New Engl. J. Med. 1164 (2009).Accordingly, agents capable of inhibiting SMO were developed.

ERIVEDGE® (vismodegib) directly binds to and inhibits SMO, and hencedecreases formation of GLI. LoRusso et al., 17 Cancer Res 2502 (2011);Sekulic et al., 2012; Von Hoff et al., 2009. See, e.g., Erivedge(vismodegib) Eur. PAR (Grenzach-Wyhlen, Germany, Roche Pharma AG, 2015),available on-line at the EMA Europa website. Vismodegib targets BCCsassociated with both constitutively activated SMO mutations and PTCH1mutations. Although vismodegib has a 30.3% independently reviewedresponse rate for metastatic BCC and a 42.9% response rate for locallyadvanced BCC in subjects for whom surgery or radiotherapy wasinappropriate, the median duration of response was only 7.6 months andtwo-thirds of treated subjects did not respond. A recent safety review,with at least 12-months follow-up, showed that 36% of subjects withdrewfrom vismodegib treatment due to adverse events, plus an additional 10%due to subject request. Bassett-Seguin et al., 2015. ODOMZO®(sonidegib), another SMO inhibitor, has a 58% independently reviewedresponse rate for locally advanced BCC and the responses appear somewhatmore durable, with 60% of locally advanced BCC, havinginvestigator-assessed responses lasting at least six months. Migden etal., 2015. Twenty-eight percent (28%) of subjects were discontinued,however, and 32% of subjects had dose adjustments for adverse reactions.Currently, the durability of responses and tolerance to SMO inhibitorsleave a substantial number of subjects with unmet medical need. See,e.g., Odomzo (sonidegib), European PAR (Nuremberg, Germany, NovartisPharma GmbH, 2015), available on-line from the EMA Europa website.

Importantly, about 20% of BCC cancers develop resistance. Ridky &Cotsarelis, 27 Cancer Cell 315 (2015). This is usually related to Hhpathway reactivation via SMO mutations that are present in only 15%-33%of untreated BCCs compared with 69%-77% of resistant BCCs. The SMOmutations either interfere with the drug binding pocket, increase basalSMO activity, or act through concurrent copy number changes insuppressor of fused protein (SUFU) and GLI2. Atwood et al., 27 CancerCell 342 (2015); Sharpe et al., 27 Cancer Cell 327 (2015). Awell-tolerated agent that could overcome these resistance pathways bytargeting mechanisms downstream of SMO would be beneficial.

BRD4 and other BET bromodomain proteins regulate GLI1 transcriptiondownstream of SMO, with BRD4 directly occupying GLI1 and GLI2 promoters.This occupancy can be inhibited by BET inhibitors; and the BETinhibitor, JQ1, decreases tumor cell proliferation both in vitro and invivo in Hh-driven tumors—even those resistant to SMO inhibition. Tang etal., 2014. Hence clinical investigation of a BET inhibitor in locallyadvanced or metastatic BCC subjects with de novo or acquired resistanceis warranted.

Accordingly, certain substituted heterocyclic derivative compounds,based on isoquinolinones and related heterocyclic structures, haveproved useful for epigenetic regulation as they inhibitbromodomain-mediated recognition of the acetyl lysine regions inproteins, such as histones; and are thus useful for the treatment ofcancer and neoplastic disease. Example cancers for which these compoundsand pharmaceutical compositions are useful include NUT midlinecarcinoma, Burkitts lymphoma, prostate cancer, breast cancer, bladdercancer, lung cancer, melanoma, glioblastoma, and the like. Thesesubstituted heterocyclic derivative compounds are based uponisoquinolinones and related heterocyclic structures, and are typicallysubstituted at the 4-position with a group such as an aryl, a heteroaryland the like, and on the nitrogen atom of the isoquinolinone or relatedheterocyclic structure with a small alkyl group, such as a methyl group.An example of such compounds,4-[2-(cyclopropylmethoxy)-5methylsulfonylphenyl]-2-methylisoquinolin-1-one,discussed further herein, is potent and reversible inhibitor of theepigenetic target BET proteins, including BRDs. In general, thesubstituted heterocyclic derivatives of the present embodiments belongto a class of compounds having the structures represented by, forexample, Formula I, Formula II, or salts thereof. See WO 2015058160;U.S. Patent Pub. No. US 20150111885; U.S. Pat. No. 9,034,900.

More specifically, an embodiment of a substituted heterocyclicderivative with BET inhibitor activity is shown in Formula I:

-   -   wherein    -   R² is CH₃, CH₂CH₃, CH₂CF₃, CH₂F, CHF₂, CF₃, CH₂D, CHD₂, or CD₃;    -   X5 is C—R⁵ or N, wherein        -   R⁵ is hydrogen, halogen, OH, CN, OR⁶¹, NHR⁶¹, N(R⁶¹)₂,            alkyl, cycloalkyl, cycloalkylalkyl, aryl, aralkyl,            heterocyclyl, heterocyclylalkyl, heteroaryl, or            heteroarylalkyl, in which            -   each R⁶¹ is independently selected from alkyl,                cycloalkyl, cycloalkylalkyl, aryl, aralkyl,                heterocyclyl, heterocyclylalkyl, heteroaryl, or                heteroarylalkyl;    -   X6 is C—R⁶, or N, wherein        -   R⁶ is hydrogen, halogen, OH, CN, alkyl, cycloalkyl,            cycloalkylalkyl, amino, alkylamino, dialkylamino,            cycloalkylalkylamino, alkoxy, or cycloalkylalkoxy;    -   X7 is C—R⁷ or N, wherein        -   R⁷ is hydrogen, halogen, OH, CN, OR⁶¹, NHR⁶¹, N(R⁶¹)₂,            alkyl, cycloalkyl, cycloalkylalkyl, aryl, aralkyl,            heterocyclyl, heterocyclylalkyl, heteroaryl, or            heteroarylalkyl;    -   X8 is C—R⁸ or N, wherein        -   R⁸ is hydrogen, halogen, or alkyl; wherein no more than two            of X5, X6, X7, or X8 may be N; and    -   R^(A) is

-   -   wherein        -   X2 is N or C—R¹², wherein R¹² is hydrogen, halogen, alkyl,            or alkoxy;        -   R¹³ is Y—Z; wherein            -   Y is selected from a bond, CH₂, CH(C₁-C₄ alkyl); and            -   Z is selected from SO₂R²¹, N(R²²)SO₂R²¹, SO₂N(R²²)₂,                N(R²²)SO₂N(R²²)₂, CON(R²²)₂, N(R²²)CO₂R²¹,                N(R²²)CON(R²²)₂, N(R²²)COR²¹, COR²¹, OC(O)N(R²²)₂,                OSO₂N(R²²)₂, or N(R²²)SO₃R²¹; wherein                -   each R²¹ is independently selected from alkyl,                    cycloalkyl, cycloalkylalkyl, aryl, aralkyl,                    heterocyclyl, heterocyclylalkyl, heteroaryl, or                    heteroarylalkyl; and                -   each R²² is independently selected from hydrogen,                    alkyl, cycloalkyl, cycloalkylalkyl, aryl, aralkyl,                    heterocyclyl, heterocyclylalkyl, heteroaryl, or                    heteroarylalkyl.            -   X3 is N or C—R¹⁴, wherein R¹⁴ is hydrogen, halogen, —CN,                alkyl, cycloalkyl, or alkoxy; and            -   X4 is N or C—R¹⁵, wherein R¹⁵ is hydrogen, halogen,                alkyl, CN, or alkoxy; and                -   R¹⁶ is hydrogen, halogen, or W—X, wherein                -    W is a bond, O, S, or NH, and                -    X is selected from alkyl, aryl, aralkyl,                    cycloalkyl, cyclo-alkylalkyl, alkynyl,                    cycloalkylalkynyl, heterocyclyl, heterocyclylalkyl,                    heteroaryl, or heteroarylalkyl.

Another an embodiment of a substituted heterocyclic derivative with BETinhibitor activity is shown as Formula II:

-   -   wherein    -   R² is alkyl, cycloalkyl, cycloalkylalkyl, heterocyclylalkyl,        aralkyl, or heteroarylalkyl;    -   X5 is C—R⁵ or N; wherein        -   R⁵ is hydrogen, halogen, OH, CN, OR⁶¹, NHR⁶¹, N(R⁶¹)₂,            alkyl, cycloalkyl, cycloalkylalkyl, aryl, aralkyl,            heterocyclyl, heterocyclylalkyl, heteroaryl, or            heteroarylalkyl, wherein            -   each R⁶¹ is independently selected from alkyl,                cycloalkyl, cycloalkylalkyl, aryl, aralkyl,                heterocyclyl, heterocyclylalkyl, heteroaryl, or                heteroarylalkyl;    -   X6 is C—H or N, provided that if X6 is N, then X5 is C—R⁵, and        if X5 is N, then X6 is CH;    -   R⁶ is hydrogen, halogen, OH, CN, alkyl, cycloalkyl,        cycloalkylalkyl, amino, alkylamino, dialkylamino,        cycloalkylalkylamino, alkoxy, S-alkyl, cycloalkylalkoxy,        heterocyclyl, aralkoxy, heteroaryloxy, aryloxy, alkynyloxy, or        N(H)COalkyl;    -   R^(A) is

-   -   in which        -   X2 is N or C—R¹², wherein R¹² is hydrogen, halogen, alkyl,            or alkoxy;        -   R¹³ is —Y—Z, wherein            -   Y is selected from a bond, —CH₂—, or —CH(C₁-C₄ alkyl)-,                and            -   Z is selected from —SO₂R²¹, —N(R²²)SO₂R²¹, —SO₂N(R²²)₂,                —N(R²²)SO₂N(R²²)₂, —CON(R²²)₂, —N(R²²)CO₂R²¹,                —N(R²²)CON(R²²)₂, —N(R²²)COR²¹, —COR²¹, —OC(O)N(R²²)₂,                —OSO₂N(R²²)₂, or —N(R²²)SO₃R²¹;                -   each R²¹ is independently selected from alkyl,                    cycloalkyl, cycloalkylalkyl, aryl, aralkyl,                    heterocyclyl, heterocyclylalkyl, heteroaryl, or                    heteroarylalkyl; and                -   each R²² is independently selected from hydrogen,                    alkyl, cycloalkyl, cycloalkylalkyl, aryl, aralkyl,                    heterocyclyl, heterocyclylalkyl, heteroaryl, or                    heteroarylalkyl;        -   X3 is N or C—R¹⁴, wherein R¹⁴ is hydrogen, halogen, —CN,            alkyl, cycloalkyl, or alkoxy;        -   X4 is N or C—R¹⁵, wherein R¹⁵ is hydrogen, halogen, alkyl,            —CN, or alkoxy; and R¹⁶ is hydrogen, halogen, N(H)COX, or            W—X, wherein W is a bond, O, S, or NH, and X is selected            from alkyl, aryl, aralkyl, cycloalkyl, cycloalkylalkyl,            alkynyl, cycloalkylalkynyl, heterocyclyl, heterocyclylalkyl,            heteroaryl, or heteroarylalkyl; provided that when X6 is N,            then R⁵ and R⁶ are not hydrogen.

A specific example of a heterocyclic derivative compound with BETinhibitor activity is4-[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2-methylisoquinolin-1-one;which has the chemical formula C₂₁H₂₁NO₄S, a molecular weight 384, andthe structure depicted in Formula III:

See WO 2015058160; U.S. Patent Pub. No. US 20150111885; U.S. Pat. No.9,034,900.

4-[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2-methylisoquinolin-1-one(Compound A) is a potent, reversible inhibitor of BET family members,including BRD2, BRD3, BRD4 and BRDT. It shows dose- and time-dependentinhibition of GLI1, and so is of value in the treatment of Hh-driventumors and tumors with GLI-driven transcription. As discussed in moredetail below, Compound A reduced tumor cell inoculation in a BLBC modelin vivo, and showed more potent activity than the current clinicalstandard, temozolomide, in the GBM3 xenograft model. Interestingly,Compound A exhibited additive or synergistic effects in combination withtemozolomide, suggesting it could be useful in tumors with CSCs andMYC-driven tumors. As noted and exemplified herein, Compound A can beformulated for oral administration.

Alkylating agents are example chemotherapeutic agents that can be usedin combination with BET inhibitors for the treatment of cancers. Forexample, temozolomide is a prodrug and an imidazotetrazine derivative ofthe alkylating agent dacarbazine. The chemical name of temozolomide is3,4-dihydro-3methyl-4-oxoimidazo[5,1-d]-as-tetrazine-8carboxamide, whichhas the following structure/formula:

Temozolomide is rapidly hydrolyzed to the active5-(3-methyltriazen-1-yl)imidazole-4-carboxamide (MTIC) at neutral andalkaline pH values, with hydrolysis taking place even faster at alkalinepH. See U.S. Pat. No. 5,260,291; WO 1997027202; WO 2002057269; WO2008038031; EP 0252682; US 2006/183898.

Temozolomide is used as an alkylating agent in the treatment of somebrain cancers, as a second-line treatment for astrocytoma, and afirst-line treatment for glioblastoma multiforme. See NICE Guidance(2001); Stevens, in CANCER DRUG DESIGN & DISCOVERY (Neidle, Ed.,Academic Press, New York, 2008). The therapeutic benefit of temozolomidedepends on its ability to alkylate/methylate DNA, which most oftenoccurs at the N-7 or O-6 positions of guanine residues. This methylationdamages the DNA and triggers the death of tumor cells. Unfortunately,some tumor cells are able to repair this type of DNA damage byexpressing O⁶-alkylguanine DNA alkyltransferase (AGT), encoded in humansby the O-6methylguanine-DNA methyltransferase (MGMT) gene, thusdiminishing the therapeutic efficacy of temozolomide. In some tumors,epigenetic silencing of the MGMT gene prevents the synthesis of thisenzyme, and consequently such tumors are more sensitive to killing bytemozolomide. Conversely, the presence of AGT protein in brain tumorspredicts poor response to temozolomide. See Sitruk et al., 38Gynécologie Obstétrique & Fertilité 660 (2010); Jacinto & Esteller, 6DNA Repair 1155 (2007); Hegi et al., 352 New Eng. J. Med. 997 (2005);Hegi et al., 10 Lancet Oncol. 459 (2009).

Temozolomide can be formulated as a capsule for oral use, each capsulecontaining 5 mg, 20 mg, 100 mg, 140 mg, 180 mg, or 250 mg temozolomide.Temozolomide can also be formulated for injection, administered byintravenous infusion, in which the dose for infusion is the same as thedose for the oral capsule formulation. For example, in newly diagnosedglioblastoma, dosing consists of 75 mg/m² for 42 days (concomitant withfocal radiotherapy) followed by 150 mg/m² for days 1 to 5 of a 28-daycycle. For refractory anaplastic astrocytoma, the initial dose is 150mg/m² once daily for five consecutive days of a 28-day cycle.

Taxanes (paclitaxel and docetaxel) represent another example of achemotherapeutic agent that may be used in combination therapy with BETinhibitors. See, e.g., U.S. Pat. No. 4,814,470. Originally isolated as anatural diterpene from Taxus brevifolia (pacific yew tree), the alkaloidpaclitaxel binds the beta-tubulin subunits of microtubules, thusstabilizing microtubules from disassembly that must occur during celldivision: blocking the normal progression of cell division by inhibitingspindle function eventually triggers apoptosis. Now obtained, interalia, by extraction from plant cell fermentation, chromatographicpurification and crystallization, paclitaxel is used to treat ovarian,breast, lung, pancreatic, and other cancers. The full chemical name ofpaclitaxel is(2a,4a,5β,7β,10β,13α)-4,10Bis(acetyloxy)-13-{[(2R,3S)-3-(benzoylamino)-2-hydroxy-3-phenylpropanoyl]oxy}-1,7dihydroxy-9-oxo-5,20-epoxytax-11-en-2-ylbenzoate; and paclitaxel has the following structure:

In some embodiments, the taxane is nanoparticle albumin-bound ABRAXANE®(paclitaxel protein-bound particles for injectable suspension) (alsocalled nab-paclitaxel). See, e.g., WO 2001089522A1. This protein-boundpaclitaxel is indicated as first-line or combination therapy for severalcancers, including non-small cell lung cancer, pancreatic cancer, andbreast cancer. See, e.g., WO 2008057562. This composition uses thenatural properties of albumin to reversibly bind paclitaxel, transportit across the endothelial cell, and concentrate paclitaxel in areas oftumor. More specifically, the mechanism of drug delivery involves, inpart, glycoprotein-60-mediated endothelial cell transcytosis ofpaclitaxel-bound albumin and accumulation in the area of tumor byalbumin binding to secreted protein, acidic, rich in cysteines (SPARC),also known as osteonectin, a glycoprotein predominantly expressed intissues undergoing remodeling during normal development or in responseto injury. Clinical studies have shown that nab-paclitaxel issignificantly more effective than other paclitaxel formulations, theformer almost doubling the response rate, increasing time before diseaseprogression, and increasing survival in second-line patients. See WO201006595.

Romidepsin acts as a prodrug with the disulfide bond undergoingreduction within the cell to release a zinc-binding thiol. The thiolreversibly interacts with a zinc atom in the binding pocket ofZn-dependent histone deacetylase to block its activity. Thus, it is anHDAC inhibitor. Many HDAC inhibitors are potential treatments for cancerthrough the ability to epigenetically restore normal expression of tumorsuppressor genes, which may result in cell cycle arrest,differentiation, and apoptosis. Romidepsin is indicated for thetreatment of patients with cutaneous T-cell lymphoma (CTCL) who havereceived ≥1 prior systemic therapy and patients with peripheral T-celllymphoma (PTCL) who have received ≥1 prior therapy.

At least one embodiment provides a combination therapy comprising one ofthe heterocyclic derivative BET inhibitors and temozolomide. In at leastone embodiment, the heterocyclic derivative is4-[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2methylisoquinolin-1-oneof Formula III (Compound A). In particular, synergistic effects havebeen observed for the use of Compound A and temozolomide in atemozolomide-resistant xenograft glioblastoma multiforme (GBM) model.More specifically, O-6-methylguanylmethyl-transferase (MGMT) has beenimplicated in GBM resistance to the alkylating DNA damage oftemozolomide. GBM3 is a GBM, patient-derived xenograft (PDX) mouse modelwith high MGMT expression, a non-methylated MGMT promoter, and atemozolomide-resistant phenotype. In previous studies of neurospherescultured from GBM3, RT-PCR showed that Compound A down-regulated MGMT ina dose-responsive manner. When mice bearing GBM3 were given a singledose of Compound A, qRT-PCR showed MGMT down-regulation in the harvestedtumor. An efficacy experiment explored whether Compound A couldsensitize temozolomide-resistant GBM to temozolomide, and whether thecombination had synergistic effects. Briefly, cohorts of mice bearingGBM3 were treated with either temozolomide, Compound A, or with acombination of Compound A and temozolomide. Tumor growth inhibition(TGI) was observed following dosing with Compound A alone or incombination with temozolomide. Although temozolomide, when given alone,did not yield significant TGI (3%); Compound A, when given alone,resulted in substantial TGI (63%) (12 mg/kg QD) and 76% (6 mg/kg BID).See FIG. 3. These data support the use of a BET inhibitor such asCompound A as a sensitizer to a chemotherapeutic agent such astemozolomide, perhaps by decreasing expression of genes responsible forresistance (e.g., drug pumps).

Surprisingly, the combination of Compound A and temozolomide wassignificantly superior to all other treatment regimens, and demonstratedsynergy. See FIG. 3. As such, it is possible that lower dosages of bothCompound A and temozolomide may be used effectively. This in turnreduces the toxicity and side effects, if any, associated with theadministration either Compound A or temozolomide without reducingefficacy.

Other in vitro and in vivo studies have been conducted to characterizeCompound A. For example, TGI by Compound A was demonstrated in xenograftmodels of TNBC and GBM tumors. In the triple-negative breast cancer(TNBC) PDX model, COH7, Compound A treatment showed significant TGI inNOD/SCID/IL2Rγc^(−/−) (NSG) mice. See FIG. 1. In the GBM PDX model,GBM15, efficacy of Compound A was exhibited using several treatmentschedules. See FIG. 2. Compound A showed dose- and time-dependentinhibition of GLI1, and may be of value in the treatment of Hh-driventumors or tumors with GLI-driven transcription, such as BCC. Compound Aalso reduced tumor cell inoculation in a basal-like breast cancer (BLBC)model in vivo, and showed more potent activity than the temozolomide inthe GBM3 xenograft model, as well as exhibiting synergistic effects incombination with temozolomide, thus suggesting Compound A in combinationwith temozolomide is useful in tumors with cancer stem cells orMYC-driven tumors. For example, regulation of MYC gene expression byBRD4 has been shown in models of Burkitt's lymphoma with inhibition ofBRD4, leading to growth arrest. Mertz, 2011.

Similarly, in a model of lung adenocarcinoma, BRD4 inhibition was alsofound to be antiproliferative; but this effect was ascribed to FOSL1down-regulation. Lockwood, 2012. BRD4 also has been shown to regulateGLI1 gene expression, thereby modulating the hedgehog signaling pathway,which is known to be dysregulated in several cancer types. Tang, 2014.Compound A treatment inhibited MYC gene expression in Raji Burkitt'slymphoma cells with a mean IC₅₀ value of 0.06 μM; FOSL1 gene expressionin U 87 glioblastoma astrocytoma cells with an IC₅₀ value of 0.03 μM;and GLI1 gene expression in MIA-PaCa-2 pancreatic adenocarcinoma cellswith an IC₅₀ value of 0.24 μM. Treatment of mice bearing COH7 (a triplenegative breast cancer (TNBC) patient-derived xenograft (PDX) tumor),with Compound A resulted in down-regulation of MYC, and modulation ofMYC expression levels correlated with intra-tumor concentrations ofCompound A. In addition to regulating gene expression in a dosedependent manner, growth of tumor cells was inhibited in vitro.

Several other in vitro and in vivo studies have been conducted tocharacterize the absorption, PK, distribution, metabolism andelimination of Compound A. Pharmacokinetics and oral bioavailability ofCompound A were evaluated in Sprague-Dawley rats and Beagle dogs. Invivo treatment of mice bearing tumors replicated the in vitro data andprovided dosing, scheduling, and plasma exposure information. Robust andreproducible bioanalytical methods for the quantitation of Compound Alevels were developed and used in PK and toxicokinetic studies. Human PKparameters and exposures were predicted using allometric scaling.

Metabolism of Compound A was evaluated in vitro using human hepatocytesand the N-desmethyl derivative was identified as single metabolite. Thismetabolite was also observed in rat, dog, and monkey hepatocytes. Nounique human metabolites were identified. Studies using recombinant CYPenzymes suggest multiple CYP enzymes can metabolize Compound A. Invitro, Compound A does not inhibit CYP1A2 and CYP3A4; but may inhibitCYP2C9, CYP2C19 and CYP2D6. In hepatocytes, Compound A did not induceCYP1A2, CYP2B6, or CYP3A4. Hence, at clinically relevant concentrations,Compound A has minimal potential to cause drug-drug interactions withco-administered drugs that are CYP substrates.

The safety and tolerability of combination therapy comprising Compound Aand temozolomide in humans, as well as the biologic and clinicalactivity, are evaluated in a clinical study. Preclinical studies onCompound A are useful for this purpose. Based on the doses and exposuresat which the principal treatment-related effects occurred in theGLP-compliant, four-week rat and dog studies, both species areconsidered of similar sensitivity to the toxicities associated withCompound A administration. A proposed human starting dose is 15 mgCompound A base, once daily for three consecutive days followed by fourconsecutive days off drug every week (3/7 day dose schedule). BecauseCompound A and temozolomide exhibit synergistic effect, the dose ofeither or both in combination therapy is examined.

The embodiments herein provide a method of treating a cancer comprisingadministration of a BET inhibitor and a chemotherapeutic agent; forexample, Compound A and temozolomide. Accordingly, the embodimentsfurther provide pharmaceutical compositions that include a BET inhibitoras an active ingredient, or both BET inhibitor and temozolomide asactive ingredients. Such pharmaceutical compositions may take anyphysical form necessary depending on a number of factors including thedesired method of administration and the physicochemical andstereochemical form taken by these agents or pharmaceutically acceptablesalts thereof. Such physical forms include a solid, liquid, gas, sol,gel, aerosol, or any other physical form now known or yet to bedisclosed. The concept of a pharmaceutical composition including the oneor both of these agents also encompasses these agents without any otheradditive. The physical form of the pharmaceutical composition may affectthe route of administration, and one skilled in the art knows to choosea route of administration that takes into consideration both thephysical form of the composition and the disorder being treated.Pharmaceutical compositions that include either BET inhibitor or bothBET inhibitor and temozolomide may be prepared using methodologywell-known in the pharmaceutical art. A pharmaceutical composition thatincludes either Compound A or both Compound A and temozolomide mayinclude an additional active agent. This additional active agent mayhave the same or a similar molecular target as Compound A, or a similarmolecular target as temozolomide or albumin-bound paclitaxel, or it mayact upstream or downstream of the molecular target(s) with respect toone or more biochemical pathways.

Methods of administration include, but are not limited to, oraladministration and parenteral administration. Parenteral administrationincludes, but is not limited to intradermal, intramuscular,intraperitoneal, intravenous, subcutaneous, intranasal, epidural,sublingual, intranasal, intracerebral, intraventricular, intrathecal,intravaginal, transdermal, rectal, by inhalation, or topically to theears, nose, eyes, or skin. Other methods of administration include butare not limited to infusion techniques including infusion or bolusinjection, by absorption through epithelial or mucocutaneous liningssuch as oral mucosa, rectal and intestinal mucosa. Compositions forparenteral administration may be enclosed in ampoule, a disposablesyringe or a multiple-dose vial made of glass, plastic or othermaterial. The combination therapy described herein encompasses BETinhibitors and temozolomide, paclitaxel or romidepsin prepared for thesame or for different routes of administration. For example, Compound Amay be prepared for oral administration, while temozolomide is preparedfor infusion.

Determination of an effective amount of BET inhibitor (such as CompoundA) and chemotherapeutic agent (such as temozolomide, paclitaxel orromidepsin) is within the capability of those skilled in the art inlight of the disclosure provided herein. The effective amount of apharmaceutical composition used for a particular purpose, as well as apharmacologically acceptable dose determined by toxicity, excretion, andoverall tolerance, may be determined in cell cultures or experimentalanimals by pharmaceutical and toxicological procedures either known nowby those skilled in the art or by any similar method yet to bedisclosed. One example is the determination of the IC₅₀ (half maximalinhibitory concentration) of pharmaceutical compositions in vitro incell lines or target molecules. Another example is the determination ofthe LD₅₀ (lethal dose causing death in 50% of the tested animals) of apharmaceutical composition in experimental animals. The exact techniquesused in determining an effective amount depend on factors such as thetype and physical/chemical properties of the pharmaceutical composition,the property being tested, and whether the test is to be performed invitro or in vivo. The determination of an effective amount of apharmaceutical composition is well-known to one of skill in the art whouses data obtained from any tests in making that determination.Determination of an effective amount of a combination of agents, e.g.,Compound A and temozolomide, paclitaxel or romidepsin, for addition to acancer cell also includes the determination of an effective therapeuticamount, including the formulation of an effective dose range for use invivo, including in humans.

Treatment is contemplated in living entities including but not limitedto mammals (particularly humans) as well as other mammals of economic orsocial importance, including those of an endangered status. Furtherexamples include livestock or other animals generally bred for humanconsumption and domesticated companion animals. The toxicity andtherapeutic efficacy of a pharmaceutical composition(s) may bedetermined by standard pharmaceutical procedures in cell cultures oranimals. Examples include the determination of the IC₅₀ and the LD₅₀ forthe combination therapy of the subject compounds. The data obtained fromthese cell culture assays and animal studies can be used in formulatinga range of dosage for use in human. The dosage may vary depending uponthe dosage form employed and the route of administration utilized.

Effective amounts of the active agents in the combined Compound A andtemozolomide therapy results in the slowing of expansion of the cancercells or TGI, but may have minimal effects on non-cancer cells.Concentrations that produce these effects can be determined using, forexample, apoptosis markers such as the apoptotic index and/or caspaseactivities either in vitro or in vivo.

The method of treating cancer using the combination Compound A andtemozolomide, paclitaxel or romidepsin include therapeutically effectiveamount of these and encompasses any method of dosing either one or bothof these compounds. Dosing may include single or multipleadministrations of any of a number of pharmaceutical compositions thatinclude Compound A, temozolomide, paclitaxel or romidepsin, or bothCompound A and temozolomide, paclitaxel or romidepsin as an activeingredient(s). Examples include a single administration of a slowrelease composition, a course of treatment involving several treatmentson a regular or irregular basis, multiple administrations for a periodof time until a diminution of the disease state is achieved,preventative treatments applied prior to the instigation of symptoms, orany other dosing regimen known in the art or yet to be disclosed thatone skilled in the art would recognize as a potentially effectiveregimen. A final dosing regimen including the regularity of and mode ofadministration depends on any of a number of factors including thesubject being treated; the biomarkers determinative of a particulardisease state or efficacy of an agent; the severity of the affliction;the manner of administration; the stage of disease development; thepresence of one or more other conditions such as pregnancy, infancy; thepresence of one or more additional diseases; or any other factor nowknown or yet to be disclosed that affects the choice of the mode ofadministration, the dose administered, and the time period over whichthe dose is administered.

Pharmaceutical compositions that include Compound A may be administeredprior to, concurrently with, or after administration of a pharmaceuticalcomposition that includes temozolomide, paclitaxel or romidepsin. If thecompositions are administered concurrently, they are administeredsimultaneously or within one minute of each other. If not administeredconcurrently, the temozolomide, paclitaxel or romidepsin and Compound Apharmaceutical composition may be administered a period of one or moreminutes, hours, days, weeks, or months before or after thepharmaceutical composition that includes the other agent. Alternatively,the combination of pharmaceutical compositions may be administeredcyclically. Cycling therapy involves the administration of one or morepharmaceutical compositions for a period of time, followed by theadministration of one or more different pharmaceutical compositions fora period of time, and repeating this sequential administration in orderto reduce the development of resistance to one or more of thecompositions, to avoid or reduce the side effects of one or more of thecompositions, or to improve the efficacy of the treatment.

Additionally, set of genes has been identified whose expression isdecreased upon ex vivo treatment with Compound A in peripheral bloodmononuclear cells (PBMCs) and in whole blood. In the present study,changes in the expression of these genes in whole blood or other genesin tumor biopsy may provide confirmation that a dose ispharmacologically active and could help distinguish which dose shows themost compelling pharmacologic activity. Predictive biomarkers allowprospective identification of patients who are likely to benefitclinically from Compound A as a single agent, in combination withtemozolomide, paclitaxel or romidepsin, or combined with other agents.Although the predictive diagnostic analyses in the current trial areexploratory in nature, they reveal associations between biomarkers andresponses that provide a basis for future diagnostically driven studies.

These embodiments further encompass methods of treating cancer thatcomprise the combination therapy described herein and further compriseanother treatment modality. Such treatment modalities include but arenot limited to, radiotherapy, chemotherapy, surgery, immunotherapy,cancer vaccines, radioimmunotherapy, treatment with pharmaceuticalcompositions other than those described herein, or any other method thateffectively treats cancer in combination with the disclosed compound nowknown or yet to be disclosed. The present combination therapy actssynergistically: the combination of Compound A and temozolomide,paclitaxel or romidepsin is more effective than either therapyadministered alone. Another treatment modality could be additive orsynergistic in efficacy. As such, lower dosages of both treatmentmodalities may be used effectively. This in turn reduces the toxicityand side effects, if any, associated with the administration eithermodality without a reduction in efficacy.

In another aspect, the combination therapy comprising Compound A andtemozolomide is administered in combination with a therapeuticallyeffective amount of radiotherapy. The radiotherapy may be administeredconcurrently with, prior to, or following the administration of theCompound A and temozolomide, paclitaxel or romidepsin therapy. Theradiotherapy may act additively or synergistically with the combinationtherapy. This particular aspect of the invention would be most effectivein cancers known to be responsive to radiotherapy. Cancers known to beresponsive to radiotherapy include, but are not limited to,Non-Hodgkin's lymphoma, Hodgkin's disease, Ewing's sarcoma, testicularcancer, prostate cancer, ovarian cancer, bladder cancer, larynx cancer,cervical cancer, nasopharynx cancer, breast cancer, colon cancer,pancreatic cancer, head and neck cancer, esophageal cancer, rectalcancer, small-cell lung cancer, non-small cell lung cancer, braintumors, other central nervous system neoplasms, or any other such tumornow known or yet to be disclosed.

In another aspect, a glioblastoma patient is treated by a bromodomaininhibitor, such as Compound A, in combination with temozolomide,paclitaxel or romidepsin. The effective dose of agents in thecombination therapy are amounts effective to prevent occurrence of thesymptoms of a disorder or to treat some symptoms of the disorder fromwhich the patient suffers. Effective dose also includes an effectiveamount, a therapeutic amount, or any amount sufficient to elicit thedesired pharmacological or therapeutic effects, thus resulting ineffective prevention or treatment of the disorder. Thus, when treating apatient with glioblastoma, an effective amount of combination therapyprovides amounts of Compound A and temozolomide, paclitaxel orromidepsin sufficient to slow, or arrest the progression, migration,metastasis, growth, or development of the tumor. The result may be thatlife is extended. A pharmacologically acceptable dose or maximumacceptable dose includes a dose that may be administered to a patientthat is not lethal to the patient, nor causes effects that threaten thehealth or the life of the patient.

In particular, patients include any human being, nonhuman primate,companion animal, or mammal suffering from a disease. In one aspect, thepatient has symptoms that signify the presence of a tumor or othergrowth in the brain. Such symptoms include headache, seizures, mental orpersonality changes, mass effect, or one of a number of focal orlocalized systems including ringing or buzzing sounds, hearing loss,loss of coordination, reduced sensation, weakness or paralysis,difficulty with walking or speech, difficulty keeping balance, decreasedmuscle control, or double vision. Patients may display one or moredifferent brain tumor types including acoustic neurinoma, astrocytoma,ependyoma, glioblastoma multiforme, meningioma, metastatic tumorsoriginating from another tumor type, mixed glioblastoma,oligodendroglioblastoma, or pineal region tumor.

Accordingly, the clinical investigation of an example BET inhibitor,Compound A, particularly in combination with temozolomide, paclitaxel orromidepsin, for antineoplastic activity in a variety of malignancies iswarranted. A study in humans is designed to evaluate drug safety andpharmacokinetic profiles with various dose levels/regimens, and alsoreflects initial signals of drug efficacy in order to advancedevelopment of Phase 2 clinical trials. All human studies are conductedin compliance with International Conference on Harmonisation GoodClinical Practices.

More specifically, a study of a BET inhibitor in combination with achemotherapeutic agent includes an open-label, Phase 1a, dose escalationand expansion, First-In-Human (FIH) clinical study in subjects with, forexample, advanced solid tumors or relapsed/refractory NHLs. The studymay be conducted in two parts: dose escalation (Part A) and doseexpansion (Part B). An example proposed human starting dose is 15 mgCompound A base, once daily for 3 consecutive days followed by 4consecutive days off drug every week (3/7 day dose schedule). A keyexploratory objective identifies a dose of BET inhibitor andchemotherapeutic agent that is not only safe but that exhibitspharmacologic activity. For example, a proposed starting dose oftemozolomide, paclitaxel or romidepsin and Compound A combinationtherapy can be ascertained with reference to the existing dosageregimens, typically with further pharmacokinetic, pharmacology, andtoxicology studies.

The dose escalation part of the study (Part A) explores escalating oraldoses of combined therapy to estimate the maximum tolerated dose (MTD)and/or RPTD of the BET inhibitor and chemotherapeutic agent. Theexpansion part of the study (Part B) further evaluates the safety andefficacy of combination therapy administered at or below the MTD inselected expansion cohorts. One or more dosing regimens or diseasesubsets may be selected for cohort expansion. Parts A and B consist ofthree periods: Screening, Treatment, and Follow-up periods (see FIG. 4).Study Objectives are summarized in Table 1, and Study Endpoints aresummarized in Table 2, both below:

TABLE 1 Study Objectives Primary Objectives The primary objectives ofthe study are: Determine the safety and tolerability of BET inhibitorcombination therapy. Define the maximum tolerated dose (MTD) or therecommended Phase 2 dose (RP2D) of combination therapy. SecondaryObjectives The secondary objectives are: Provide information on thepreliminary efficacy of combination therapy. Characterize thepharmacokinetics (PK) of each component of combination therapy.Exploratory Objectives The exploratory objectives are: Evaluate thepharmacodynamic (PD) effects of combination therapy on gene expressionin peripheral blood and if available, in tumor samples. Explore therelationship between combination therapy dose, plasma exposure, andselected clinical endpoints (e.g., measures of toxicities, preliminaryactivity, or biomarkers). Characterize the principal metabolites ofcombination therapy in plasma provided sufficient data are available.

TABLE 2 Study Endpoints Time- Endpoint Name Description frame PrimarySafety DLTs and MTD evaluated Dose endpoints using the NCI CTCAEescalation criteria, Version 4.03 Secondary Preliminary Determined byresponse Dose efficacy rates by disease- escalation appropriate responsecriteria and expansion Disease control rate (DCR), Dose objectiveresponse escalation rate (ORR), duration of and response or stabledisease, and expansion progression-free survival (PFS) Overall Fromrandomization to death Dose survival due to any cause escalation andexpansion PK Peak (maximum) plasma Dose endpoints concentration of drugsescalation (C_(max)), area under the plasma concentration time-curve(AUC), time to peak (maximum) plasma concentration (t_(max)), terminalhalf-life (t_(1/2)), apparent clearance (CL/F), apparent volume ofdistribution (Vz/F), and accumulation index of each component ofcombined therapy Exploratory PD Gene expression in peripheral Doseendpoints blood cell components escalation Gene expression in tumor andtissue, if available expansion DLT = dose-limiting toxicity; MTD =maximum tolerated dose; NCI CTCAE = National Cancer Institute CommonTerminology Criteria for Adverse Events; NTD = non-tolerated dose; RNA =ribonucleic acid.

During the treatment period, formulations comprising BET inhibitor maybe initially administered orally once daily (QD) for three consecutivedays followed by four consecutive days off drug every week(three-/seven-day dose schedule) in each four-week cycle. Alternatedosing schedules (e.g., two-days-on/five-days-off, each week) areexamined based on the SRC review of available safety, PK,pharmacodynamic (PD), and efficacy data. During the combinationtreatment period, formulations comprising BET inhibitor may be initiallyadministered orally, once daily for three consecutive days followed byfour consecutive days off drug every week (three-/seven-day doseschedule) in each four-week cycle; and formulations comprisingtemozolomide may be administered on days 7 to 9 and 22 to 24 of afour-week cycle. Alternate dosing schedules (e.g.,two-days-on/five-days-off, each week) are examined based on the SRCreview of available safety, PK, pharmacodynamic (PD), and efficacy data.

The decision to evaluate additional subjects within a dose cohort, ahigher dose cohort, intermediate dose cohorts, smaller dose increments,alternate dosing schedules (e.g., BET inhibitortwo-days-on/five-days-off, each week), or declare a MTD, is alsodetermined by the SRC based on the BLRM assessment and their review ofavailable safety (i.e., DLT and nonDLT data), PK, PD, and efficacyinformation.

After the first dose is administered in any cohort during doseescalation, subjects in each cohort are observed for 28 days before thenext dose cohort can begin. No more than one subject per day is enrolledin a given dose escalation cohort. Subjects non-evaluable for DLT arereplaced.

Regarding Part B-Cohort Expansion, following completion of doseescalation (Part A), selected tumor cohorts are enrolled into anexpansion phase (Part B) with up to approximately twenty evaluablesubjects each. Expansion may occur at the MTD and schedule establishedin the dose escalation phase, or at an alternative tolerable dose andschedule, based on review of available safety, PK, PD, and efficacy datafrom Part A combination therapy. One or more dosing regimens may beselected for cohort expansion. The SRC continues reviewing safety dataregularly throughout the study, and recommends study continuation anddose modification, as appropriate.

For example, Compound A can be formulated as tablets for oraladministration; and temozolomide can be formulated as capsules for oraladministration. Alternatively, Compound A and temozolomide areco-formulated as a single tablet or capsule for oral administration. Inanother alternative example, Compound A is formulated as tablets fororal administration and temozolomide is formulated for infusion. Asanother example, because albumin-linked paclitaxel is formulated forinfusion, Compound A may be formulated for oral administration.Alternatively, Compound A may be adapted to be infused with theprotein-linked paclitaxel. Labeling is appropriate, e.g., forinvestigational use as per the regulations of the relevant countryhealth authority.

For key efficacy assessments, subjects are evaluated for efficacy afterevery two cycles through Cycle 6, and thereafter every three cycles. Allsubjects who discontinue treatment are followed until progression orinitiation of new systemic anticancer therapies. In the follow-upperiod, all subjects are followed for safety after the last dose of anycomponent of the combined therapy. After the safety follow-up visit, allsubjects are followed every subsequent three months for survivalfollow-up for up to two years or until death, lost to follow-up, or theend of trial.

Tumor response is determined. For solid tumors, assessment is based onResponse Evaluation Criteria in Solid Tumors (RECIST 1.1). Eisenhauer etal., 45 Eur. J. Cancer 228 (2009). For NHLs, assessment is based on theInternational Working Group Revised Response Criteria for MalignantLymphoma. Cheson et al., 25 J. Clin. Oncol. 579 (2007).[¹⁸F]luorodeoxyglucose (FDG) positron emission tomography (PET) or FDGPET/CT imaging is required to confirm a complete response in subjectswith FDG-avid tumors.

During the Part A dose escalation, approximately thirty to fortysubjects are enrolled. During the Part B dose expansion, at leastfourteen efficacy evaluable subjects for each tumor cohort are accruedinitially. If the response rate is 20% or more, there is more than a 95%chance that one or more responders would be observed in the firstfourteen subjects, to be updated by statistics based on change to DCR asa primary efficacy endpoint. Gehan, 13 J. Chronic Dis. 346 (1961). If noresponder is observed out of fourteen subjects, the enrollment for thistumor cohort is stopped for futility. Otherwise, the tumor cohort isexpanded to up to approximately twenty subjects if a responder isobserved.

At all decision time points, the BLRM permits alterations in the doseincrements based on the observed DLTs; however, the dose for the nextcohort will not exceed a 100% increase from the prior dose. The MTD isthe highest dose that is unlikely (<25% posterior probability) to causeDLT in ≥33% of the treated subjects in the first cycle of active agent.

Regarding Part B, Cohort Expansion, following completion of doseescalation (Part A), selected tumor cohorts are enrolled into anexpansion phase (Part B) with up to approximately twenty evaluablesubjects each. Expansion may occur at the MTD and schedule establishedin the dose escalation phase, or at an alternative tolerable dose andschedule, based on review of available safety, PK, PD, and efficacy datafrom Part A. One or more dosing regimens may be selected for cohortexpansion.

The End of Trial is defined as either the date of the last visit of thelast subject to complete the post-treatment follow-up, or the date ofreceipt of the last data point from the last subject that is requiredfor primary, secondary and/or exploratory analysis, as pre-specified inthe protocol, whichever is the later date.

EXAMPLES Example 1. Synthesis of4-[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2methylisoquinolin-1-one(Compound A)

Unless otherwise noted, reagents and solvents were used as received fromcommercial suppliers. Anhydrous solvents and oven-dried glassware wereused for synthetic transformations sensitive to moisture and/or oxygen.Yields were not optimized. Reaction times are approximate and were notoptimized. Column chromatography and thin layer chromatography (TLC)were performed on silica gel unless otherwise noted. Spectra are givenin ppm (0) and coupling constants (J) are reported in Hertz. For ¹H NMRspectra, the solvent peak was used as the reference peak.

Step 1:2-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)isoquinolin-1-one

A suspension of 4-bromo-2-methylisoquinolin-1-one (100 mg, 0.42 mmol),bis(pinacolato)diboron (214 mg, 0.84 mmol), Pd(dppf)Cl2 (31 mg, 0.04mmol) and potassium acetate (104 mg, 1.05 mmol) in dioxane (2 mL) underN2 was warmed to 90° C. for 135 min. It was then cooled to room temp anddiluted with EtOAc (8 mL). The mixture was washed with an aq satd solnof NaHCO₃ (8 mL) and brine (8 mL). The organic phase was separated,dried over Na2SO₄, filtered and concentrated under reduced pressure. Theresidue was purified by normal phase CC (10%-90% EtOAc/Hexanes) to givethe title compound (44 mg, 37%). ¹H NMR (CDCl₃, 400 MHz): δ 8.43 (d,J=7.9 Hz, 1H), 8.40 (dd, J=8.2 Hz, 0.9 Hz, 1H), 7.68 (s, 1H), 7.65 (ddd,J=8.2, 8.2, 1.1 Hz, 1H), 7.46 (t, J=7.5 Hz, 1H), 3.63 (s, 3H), 1.38 (s,12H). LCMS (M+H)+: 286.

Step 2:4-[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2-methylisoquinolin-1-one

(cyclopropylmethoxy)-4-methylsulfonylbenzene or4-bromo-2-methylisoquinolin-1(2H)-one and2-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)isoquinolin-1-onefor N-benzyl-2methoxy-5-(tetramethyl-1,3,2-dioxaborolan-2-yl)benzamide.1H NMR (DMSO-d6, 400 MHz): δ 0.09 (m, 2H), 0.29 (m, 1H), 0.35 (m, 1H),0.94 (m, 1H), 3.22 (s, 3H), 3.57 (s, 3H), 3.95 (m, 2H), 7.16 (d, J=7.9Hz, 1H), 7.37 (d, J=8.8 Hz, 1H), 7.53 (m, 2H), 7.65 (t, J=7.6 Hz, 1H),7.81 (d, J=2.4 Hz, 1H), 7.97 (dd, J=8.8, 2.4 Hz, 1H), 8.30 (d, J=8.1 Hz,1H). LCMS (M+H)+: 384.

Alternatively,4-[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2-methylisoquinolin-1-onecan be prepared as described below.

Step 1:2-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)isoquinolin-1-one

A mixture of 4-bromo-2-methylisoquinolin-1-one (8.0 g, 33.6 mmol),bis(pinacolato)diboron (17.1 g, 67.2 mmol), KOAc (6.6 g, 67.2 mmol),Pd₂(dba)₃ (3.1 g, 3.36 mmol) and X-Phos (1.6 g, 3.36 mmol) in anhydrousdioxane (200 mL) was stirred at 60° C. for 12 hr. The reaction mixturewas concentrated and the residue was purified by column chromatographyon silica gel (PE:EA=15:1) to give the title compound (6.0 g, 62%) as asolid.

Step 2:4-[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2-methylisoquinolin-1-one

The title compound from Step 1 (5.0 g, 17.5 mmol),2-bromo-1-(cyclopropyl-methoxy)-4-methylsulfonylbenzene (6.4 g, 21mmol), K3PO4 (9.3 g, 43.9 mmol) and Pd(dppf)Cl₂ (1.4 g, 1.75 mmol) in adioxane/water (100 mL/10 mL) mixture were stirred at 60° C. for 12 hr.The reaction mixture was concentrated under reduced pressure and theresidue was purified by column chromatography on silica gel(EA:DCM=1:4). Appropriate fractions were combined and concentrated underreduce pressure. The resultant solid was recrystallized from DCM:MTBE(1:1) (50 mL) to give the title compound (4.0 g, 60%) as a white solid.¹H NMR: (CDCl3, 400 MHz) δ 8.51 (dd, J1=8.0 Hz, J2=0.8 Hz, 1H), 7.98(dd, J1=8.4 Hz, J2=2.4 Hz, 1H), 7.86 (d, J=2.4 Hz, 1H), 7.53 (m, 2H),7.16 (d, J=7.6 Hz, 1H), 7.10 (m, 2H), 3.88 (m, 2H), 3.66 (s, 3H), 3.09(s, 3H), 1.02-0.98 (m, 1H), 0.44-0.38 (m, 2H), 0.11-0.09 (m, 2H). LCMS:384.1 (M+H)⁺.

Example 2. In Vitro Inhibition Assay and In Vitro Cell-Based Assay

The IC₅₀ for the heterocyclic derivative BRD4 inhibitors describedherein (see U.S. Pat. No. 9,034,900), including Compound A, wasdetermined. His-tagged BRD4 was cloned, expressed and purified tohomogeneity. Filipakopoulos et al., 468 Nature 1067 (2010). BRD4 bindingand inhibition was assessed by monitoring the interaction ofbiotinylated H4-tetraacetyl peptide (AnaSpec, H4K5/8/12/16(Ac),biotin-labeled) with the target using the AlphaScreen technology (LifeTechnologies). In a 384-well ProxiPlate BRD4(BD1) (2 nM final) wascombined with peptide (15 nM final) in 50 mM HEPES (pH 7.3), 10 mM NaCl,0.25 mM TCEP, 0.1% (w/v) BSA, and 0.005% (w/v) Brij-35 either in thepresence of DMSO (final 0.4% DMSO) or compound dilution series in DMSO.After 20 min incubation at room temp, Alpha streptavidin donor beads andNickel Chelate acceptor beads were added to a final concentration of 5μg/mL. After 2 hr of equilibration, plates were read on an Envisioninstrument and the IC₅₀ was calculated using a 4-parameter non-linearcurve fit. The ability of Compound A to inhibit BRD4 activity wasquantified, and the respective IC₅₀ value was determined.

A colorimetric cellular proliferation assay (Cell-MTS assay) wasperformed to assess the ability of the heterocyclic derivative BRD4inhibitors disclosed herein (see U.S. Pat. No. 9,034,900), includingCompound A, to effect the proliferation of established cancer celllines. The Cell-MTS assay is a 7-day plate-based colorimetric assaywhich quantifies the amount of newly generated NADH in the presence orabsence of test compound. The NADH level is used for the quantificationof cancer cell proliferation. Established cancer cell lines with avariety of driving mutations were obtained from American Type CultureCollection (ATCC) and routinely passaged according to ATCC protocols.For routine assay, these cells were seeded at densities which enabledabout 90% confluence after 7 days of culture. Raji, human Burkittslymphoma cells, (cMYC) were seeded at 15,000 cells per 96-well. HL-60,human proleukemia cells, (NRAS, p16, p53, c-Myc amplified) were seededat 5,000 cells per 96-well. NCI-H460, human non-small cell lung cancercells, (KRAS, PIK3CA, STLK11, p16) were seeded at 3,000 cells per96-well.

Then, 24 hr after plating, cells received an 11-point dilution of testcompound with final concentration ranges from 100 μM to 2.0 nM. Cellswere incubated in the presence of compound for 168 hr at 37° C., and 5%CO₂. At the end of this incubation period, 80 μL of media was removedand 20 μL of CellTiter 96® AQueous Non-Radioactive Cell ProliferationAssay solution (Promega) was added. The cells were incubated until theOD₄₉₀ was >0.6. IC₅₀ values were calculated using the IDBS XLfitsoftware package and include background subtracted OD490 values andnormalization to DMSO controls. Cellular proliferation IC₅₀ values wereuploaded and archived using the Chem Biography Platform.

The IC₅₀ data for4-[2-(cyclopropylmethoxy)-5-methylsulfonylphenyl]-2methylisoquinolin-1-onein these in vitro assays is as follows:

BRD4 IC₅₀ (μM) Raji IC₅₀ (μM) HL-60 IC₅₀ (μM) H460 IC₅₀ (μM) ≤5 μM ≤5 μM≤5 μM >5 μM

Example 3. In Vitro Pharmacology

Regulation of MYC gene expression by BRD4 has been shown in models ofBurkitt's lymphoma with inhibition of BRD4, leading to growth arrest(Mertz, 2011). Similarly, in a model of lung adenocarcinoma, BRD4inhibition was also found to be antiproliferative; however, this effectwas ascribed to FOSL1 down-regulation (Lockwood, 2012). BRD4 has alsobeen shown to regulate GLI1 gene expression, thereby modulating the Hhsignaling pathway, which is known to be dysregulated in several cancertypes. (Tang, 2014). The effect of Compound A treatment on MYC, FOSL1,and GLI1 gene expression was evaluated by quantitative reversetranscription polymerase chain reaction (qRT PCR). Treatment withCompound A inhibited MYC gene expression in Raji Burkitt's lymphomacells with a mean half-maximal inhibitory concentration (IC₅₀) value of0.06 μM; FOSL gene expression in U 87 glioblastoma cells with an IC₅₀value of 0.03 μM; and GLI1 gene expression in MIA-PaCa-2 pancreaticadenocarcinoma cells with an IC₅₀ value of 0.24 μM.

Compound A demonstrated in vitro inhibition of tumor cell growth usingantiproliferative two-dimensional (2-D) cultures with cell lines andinhibition of colony formation using three-dimensional (3-D) organoidcultures with cells from PDX GBM tumor models and PDX breast cancermodels.

The effect of Compound A on colony formation in fourteen PDX-derived GBMtumor models was assessed using an in vitro neurosphere assay. CompoundA was tested at concentrations ranging from 0.0003 μM to 20 μM, in3-fold increments. Colony formation was assessed after seven days oftreatment by quantifying colony numbers by microscopy. Compound Ainhibited colony formation in a dose-dependent manner, yielding meanhalf maximal inhibitory concentration (IC₅₀) values±standard error ofthe mean (SEM) ranging from 0.11±0.04 μM to 2.00±0.40 μM and spanning an18-fold activity range. The overall mean for the GBM models was0.62±0.13 μM.

The effect of Compound A on colony formation in four PDX-derived breastcancer models was assessed using a 3-D Matrigel-based in vitro culturesystem. Compound A was tested at concentrations ranging from either0.008 μM to 5 μM or 0.0016 μM to 1 μM in 5-fold increments. Colonyformation was assessed after 7 days or 14 days of treatment byquantifying colony numbers by microscopy. Compound A inhibited colonyformation in a dose-dependent manner yielding a mean IC₅₀ value for theBR0869f estrogen receptor (ER) negative, progesterone receptor (PR)negative, and HER2/neu positive (ER—PR-Her2+) tumor model of 0.12±0.01μM and IC50 values for the COH69, COH71, and TNBR3 triple negativebreast cancer (TNBC) models of 0.07 μM, 0.18±0.02 μM, and 0.08±0.00 μM,respectively. The overall mean for the three TNBC models was 0.11±0.04μM.

Example 4. In Vivo Pharmacology

In mouse studies, Compound A has demonstrated dose-dependent tumorgrowth inhibition (TGI) in patient-derived xenografts (PDX) of TNBC andGBM tumors. Additionally, using limiting dilution assays, a decrease intumor initiating cell (TIC) frequency has been shown following treatmentwith Compound A (performed with a daily dosing schedule and not includedin the Clinical Trial Application.

Different doses and schedules of Compound A were evaluatedpre-clinically. Compound A dosed on a 3-days-on/4-days-off scheduleshowed TGI efficacy equivalent to that seen in the continuous dosingschedules as well as improved tolerability relative to continuous dosingschedules. Body weight, gastrointestinal (GI), and bone marrow (BM)toxicities appeared fully reversible by less frequent dosing schedules,and recovery was suitable for weekly repeat dosing.

Treatment of mice bearing COH70, a TNBC PDX tumor, with Compound A at 2mg/kg or 10 mg/kg resulted in down-regulation of MYC. Compound A at 2mg/kg maximally suppressed MYC expression by 51.3% at 2 hr, with MYCexpression rebounding to control levels by 8 hr post-dose. Compound A at10 mg/kg maximally suppressed MYC expression by 63.4% at 4 hr; however,MYC expression did not rebound to control levels by 24 hr post-dose.Corresponding tumor concentrations of Compound A were determined in theCOH70 model at 2, 4, and 8 hrs post-dose. Maximally-measured tumorlevels of Compound A were at 2 hr post-dose and were 1.3±0.3 μM and6.7±1.7 μM at 2 mg/kg and 10 mg/kg, respectively. Modulation of MYCexpression levels correlated with intra-tumor concentrations of CompoundA.

The TNBC PDX subcutaneous model was noted to have significant TGI inNOD/SCID gamma (NSG) mice at Compound A doses of 12.5 mg/kg, 16 mg/kg,and 20 mg/kg. Dosing was orally by gavage once daily (QD) for 3consecutive days followed by 4 days off (designated as 3×/week inFIG. 1) (3×/week=3 consecutive days of once daily Compound A dosingfollowed by 4 days off; PO=by mouth; SEM=standard error of the mean)each week for 6 weeks.

Compound A was well tolerated up to a daily dose of 25 mg/kg. When tumorvols. were measured on Day 38, compared to vehicle control, the meanpercent TGI of treated tumors was 64% for 12.5 mg/kg/dose group, 68% forthe 16 mg/kg/dose group, and 72% for the 20 mg/kg/dose group. Mean bodyweights increased in all groups. Steady state pharmacokinetic parameterswere determined following the final doses for the 12.5 mg/kg and 16mg/kg dose levels. The area under the plasma concentration-time curvebetween 0 hr and 24 hr (AUC₀₋₂₄ hr) of Compound A at 12.5 mg/kg was12,003 ng-hr/mL; and at 16 mg/kg was 15,174 ng-hr/mL.

In a GBM PDX subcutaneous model, GBM15, efficacy of Compound A was shownon several schedules ranging from dosing 5-times QD weekly to twiceweekly for 4 weeks (FIG. 2) (PO=by mouth; SEM=standard error of themean). Mice bearing tumors were dosed orally QD on several scheduleswith the cumulative weekly Compound A dose on each schedule equal to 75mg/kg. Dosing schedules were:

-   -   15 mg/kg Compound A for 5 consecutive days on and 2 days off        (5/2),    -   25 mg/kg Compound A for 3 consecutive days on and 4 days off        (3/4), and    -   37.5 mg/kg Compound A for 2 consecutive days on and 5 days off        (2/5).

When tumor volumes were measured on Day 29 and compared with controlvehicle, the mean percent TGI of treated tumors were 65% for the 15mg/kg/dose (5/2) group, 65% for the 25 mg/kg/dose (3/4) group, and 70%for the 37.5 mg/kg/dose (2/5) group. Minimal weight loss was seen in allgroups (vehicle group=−1.2%; 15 mg/kg/dose group=−6.6%; 25 mg/kg/dosegroup=−3.7%; and 37.5 mg/kg/dose group=−3.1%).

Xenograft models of NUT Midline Carcinoma (NMC) in mice are studied.Matched cohorts of mice with established tumors are randomized totreatment with a test compound (either Compound A, or temozolomide, or aformulation comprising both Compound A and temozolomide) or vehicle,administered by daily intraperitoneal injection. Before randomizationand after 4 days of therapy, mice are evaluated by¹⁸F-fluorodeoxyglucose (FDG)-PET imaging. Tumor-volume, toxicity, orweight loss are measured. Tumors are obtained and sectioned and examinedimmunohistochemically for the BRD4-NUT oncoprotein, cell spreading,keratin expression, nuclear Ki67, and TUNEL staining. Paired samplesfrom treated and untreated mice are prepared and analyzed usingstandardized protocols and commercially available software (i.e.,ImageScopt; Aperio Technologies).

Example 5. Antitumor Efficacy in Xenograft Model of MCF-7 Breast Cancer

Time release pellets containing 0.72 mg 17-β Estradiol aresubcutaneously implanted into nu/nu mice. MCF-7 cells are grown in RPMIcontaining 10% FBS at 5% C02, 37° C. Cells are spun down andre-suspended in 50% RPMI (serum free) and 50% Matrigel at 1×10⁷cells/mL. MCF-7 cells are subcutaneously injected (100 μL/animal) on theright flank 2-3 days post-pellet implantation and tumor vol.(length×width2/2) is monitored biweekly. When tumors reach an averagevolume of −200 mm³, animals are randomized and treatment is started.Animals are treated with a test compound or vehicle daily for 4 weeks.Tumor volume and body weight are monitored bi-weekly throughout thestudy. At the conclusion of the treatment period, plasma and tumorsamples are taken for pharmacokinetic and pharmacodynamic analyses,respectively.

Example 6. Antitumor Efficacy in Raji Human Burkitts Lymphoma Model

Procedure: Female SCID CB 17 mice (6-8 weeks old, Charles River Lab)were inoculated subcutaneously in the right flank region with Raji cells(at 3.5×10⁶ cells/mouse) and the tumor was allowed to grow toapproximately 150 mm³. Mice were then randomized into treatment cohorts(N=8) and treated orally once daily with vehicle control or testcompound for 21 days. Test compound was administered as a suspension in1% Tween 80, 40% PEG400, and either 59% of 0.5% HPMC, or 9% DMSO+50% of0.5% HPMC, at doses ranging from 5 mg/kg to 50 mg/kg. Tumor length andwidth were measured in millimeters three times per week. Tumor volumeswere calculated by the formula V=(L×W×W)/2. Tumor growth inhibition(TGI) was calculated with the formula: TGI=100−(median tumor volume oftreatment group/median tumor volume of vehicle control group)×100. TGImeasurements were performed until the volume of a tumor in the controlgroup reached 3,000 mm³. Statistical analysis was performed using2-tailed T-test. P values <0.05 were considered as statisticallysignificant. TGI was determined to range from 42% to 80%.

Example 7. Synergistic Effects of Compound A and Temozolomide in aTemozolomide-Resistant Xenograft GBM Model

O-6-methylguanylmethyltransferase (MGMT) has been implicated in GBMresistance to the alkylating DNA damage of temozolomide (TMZ). GBM3 is aGBM PDX subcutaneous model with high MGMT expression by PCR, anon-methylated MGMT promoter, and has the phenotype of being resistantto TMZ. In previous studies of neurospheres cultured from GBM3, RT-PCRanalysis showed that Compound A, in a dose-responsive manner,downregulated expression of MGMT. When mice bearing GBM3 were given asingle dose of Compound A at 20 mg/kg, qRT-PCR revealed down-regulationof MGMT in the harvested tumor. This led to an efficacy experiment tounderstand whether Compound A could sensitize TMZ-resistant GBM to TMZ,and exhibit synergistic effects compared with either compoundadministered alone.

Cohorts of NSG mice bearing GBM3 were treated with TMZ 50 mg/kgintraperitoneal (IP)×3 Q2 weeks; Compound A 6 mg/kg orally twice daily(BID) or 12 mg/kg orally once daily; or with a combination of Compound A6 mg/kg orally BID and TMZ 50 mg/kg IP×3 Q2 weeks. Significant tumorgrowth inhibitions, as measured by tumor volumes, were observedfollowing dosing with Compound A alone or in combination with TMZ (FIG.3). TMZ alone did not induce significant TGI when given alone (3%).Compound A alone induced significant TGIs of 63% (12 mg/kg QD) and 76%(6 mg/kg BID). The combination of Compound A and TMZ demonstratedsynergy, however, and was significantly superior to all other regimensin terms of TGI. Moderate weight loss was observed during part of thestudy course (nadir −5.1%) in the combination group; but body weightloss recovered, and all treatment groups exhibited net gain in mean bodyweight at study end.

Example 8. Oral Dosage Form

A tablet is prepared by mixing 48% by weight of Compound A, or apharmaceutically acceptable salt thereof, 45% by weight ofmicrocrystalline cellulose, 5% by weight of low-substitutedhydroxypropyl cellulose, and 2% by weight of magnesium stearate. Tabletsare prepared by direct compression. The total weight of the compressedtablets is maintained at 250-500 mg.

Example 9. Nonclinical Pharmacokinetics and Drug Metabolism

As described herein, a battery of in vitro and in vivo studies have beenconducted to characterize the absorption, PK, distribution, metabolismand elimination of Compound A. Robust and reproducible bioanalyticalmethods for the quantitation of Compound A levels were developed andused in PK and toxicokinetic studies. Human PK parameters and exposureswere predicted using allometric scaling.

Pharmacokinetics and oral bioavailability of Compound A were evaluatedin Sprague-Dawley rats and Beagle dogs. The systemic clearance was low(˜5%-13% of liver blood flow) in both male and female rats, but malesshowed approximately 2-fold higher clearance than females. The volume ofdistribution ranged from about 1- to 3-fold the total body water volume,suggesting distribution of Compound A into tissues. The mean oralbioavailability of Compound A was 40% in rats and 76% in dogs. Due todifferences in systemic clearance between male and female rats and inorder to obtain comparable systemic exposure in toxicology studies,Compound A doses administered to male rats were 3-fold higher than tofemale rats. Toxicokinetics of Compound A in rats and dogs showed no sexdifferences in systemic exposure, dose-proportional increase in systemicexposure, no accumulation in rats, and up to 3-fold accumulation in dogsafter repeat dosing. Compound A showed limited brain distribution withbrain to plasma ratios of 0.14 to 0.16 in tumor-bearing NSG mice.

Using the allometry-derived PK parameters and an assumption of 62% oralbioavailability (the average observed in pre-clinical species), thepredicted steady state systemic exposure (AUC0 24 hr) of Compound A inhumans following weekly (3 days on/4 days off) administration of a 15 mgoral dose can range from 731 to 2263 ng*h/mL. No notable differences inplasma protein binding of Compound A were observed in plasmas derivedfrom preclinical species (89.9% to 93.3%) and human sources (90.2%).

Metabolism of Compound A was evaluated in vitro using human hepatocytesand a single metabolite, namely the N-desmethyl derivative wasidentified. This metabolite was observed in rat, dog and monkeyhepatocytes. No unique human metabolites were identified. Studies usingrecombinant cytochrome P450 (CYP) enzymes suggest that multiple CYPenzymes (CYP2C9, CYP2C19 and CYP3A4) are capable of metabolizingCompound A; yet the relative contribution of the individual enzymes isunknown.

In vitro, Compound A does not inhibit CYP1A2 and CYP3A4. Compound Acaused inhibition of CYP2C9, CYP2C19, and CYP2D6 with IC50 values of13.9 μM, 26.7 μM, and 54.3 μM, respectively. In hepatocytes, Compound A(up to 10 μM) is not an inducer of CYP1A2, CYP2B6, or CYP3A4. Hence, atclinically relevant concentrations, Compound A has minimal potential tocause drug-drug interactions with co-administered drugs that are CYPsubstrates.

In rats, following intravenous (IV) administration of non-radiolabeledCompound A, an average of 0.9% of the dose was excreted intact either inbile or urine, indicating that excretion of intact drug is not theprimary mode of elimination and that metabolism may play a major role indisposition of Compound A.

Example 10. Nonclinical Toxicology

Compound A was evaluated in non-GLP exploratory toxicology and genetictoxicology studies, and in GLP repeat-dose (≤4-week nonclinicaltoxicology) studies. GLP 4-week oral toxicity studies (with a 4-weekrecovery period) were conducted in rats (0, 5, 10, or 20 mg base/kg/dosefor females, and 0, 15, 30, or 60 mg base/kg/dose for males), and Beagledogs (0, 1.75, 3.75, or 7.5 mg base/kg/dose). The dosing schedule wasonce daily administration for 3 consecutive days followed by 4consecutive days off drug each week for a total of 4 weeks.

In rats, the primary target tissues of toxicity are those that make upthe gastrointestinal (GI) tract, bone marrow, lymphoid organs, testes,and bone. In dogs, the primary target tissues of toxicity are those thatmake up the GI tract, bone marrow, lymphoid organs, and testes.

In the 4-week rat study, the ≥20 mg base/kg/dose was severely toxic.This dose resulted in the death or moribund sacrifice of animals asearly as Day 6, ultimately leading to termination of dosing andsacrifice of the surviving 60 mg base/kg/dose group animals (males) onDay 11; and the termination of dosing and sacrifice on Day 11 of thesurviving 20 mg base/kg/dose group animals (females) (N=9) or start ofrecovery phase for (N=4). There were no Compound A-related mortalitiesat doses below 20 mg base/kg/dose. There were no adverse findings at thelow dose level (5 mg base/kg/dose [females], 15 mg base/kg/dose[males]).

Regarding toxicity, based upon the constellation of clinical,laboratory, gross pathologic, and histopathologic findings, the severelytoxic dose in 10% of the rats (STD10) was 20 mg base/kg/dose in femalesand 30 mg base/kg/dose in males. For any clinical trial, the overarchingSTD10 should be considered 20 mg base/kg/dose. Due to the lack ofadverse findings, the no-observed-adverse-effect level (NOAEL) infemales was 5 mg/kg/dose and in males was 15 mg/kg/dose. For anyclinical trial, the overarching NOAEL should be considered 5 mgbase/kg/dose. These values apply to the three-days-on/four-days-offCompound A dose schedule. Evaluation of recovery animals demonstratedthat all test article related findings were reversible after a period of4 weeks from the cessation of dosing (with the exception of thetestis-related findings which could not be evaluated due to the moribundsacrifice of the 60 mg base/kg/dose group males originally designated toevaluate reversibility).

Safety pharmacology evaluations, i.e., functional observational battery(FOB), were also performed to determine the potential central nervoussystem effects of Compound A as part of the GLP 4-week repeat-dosetoxicity rat study. There were no Compound A-related FOB effects.

In the 4-week Beagle dog study, the severely toxic dose was 7.50 mgbase/kg/dose. This dose resulted in the moribund sacrifice of animals (4males and 1 female) as early as Day 11, ultimately leading totermination of dosing of the surviving 7.50 mg base/kg/dose group males,and the start of recovery phase for the surviving 7.50 mg base/kg/dosegroup males. There were no Compound A-related mortalities at doses below7.50 mg base/kg/dose, but there were Compound A-related findings at alldoses evaluated.

Based upon the constellation of clinical, laboratory, gross pathologic,and histopathologic findings, 3.75 mg base/kg/dose was established asthe highest non-severely toxic dose (HNSTD); no NOAEL was identified.These values apply to the 3-days-on/4-days-off dose schedule. At thelowest dose (1.75 mg base/kg/dose), adverse findings were limited todecreased thymus weights and testicular/epididymal toxicity. Evaluationof recovery animals demonstrated that all test article-related findingswere reversible after a period of four weeks from the cessation ofdosing with the exception of the testis- and epididymis-relatedfindings.

Safety pharmacology evaluations were performed to determine thepotential cardiovascular and respiratory effects of Compound A inconscious Beagle dogs as part of the GLP 4-week repeat-dose toxicitystudy. There were no Compound A-related effects on electrocardiograms,heart rate, or respiratory rate.

An in vitro human ether-h-go-go-related gene (hERG) study identified anIC₅₀ of 24.3 μM. In a non-GLP bacterial reverse mutation assay (Ames),Compound A was determined to be non-mutagenic.

Overall, Compound A exhibits an acceptable safety profile in preclinicalspecies for an oncology clinical candidate, and the toxicology programfor Compound A adequately supports the conduct of clinical trials incancer patients.

Example 12. Safety and Tolerability of Compound a in Humans

Compound A is a new investigational product that has a strong biologicalrationale for the treatment of subjects with solid tumors and NHLs. Thesafety and tolerability of Compound A in humans, as well as the biologicand clinical activity, are evaluated in a clinical study.

Because no clinical studies have been conducted with Compound A, theefficacy and safety profiles of Compound A in humans are unknown.Potential toxicities for Compound A are identified based on nonclinicalstudies with Compound A. The safety profiles of two BET inhibitorstested in Phase I first-in-human (FIH) studies reveal good tolerabilitywith continuous daily dosing for 14 days in each 21-day cycle withthrombocytopenia as major DLT (Abramson, 2015; Herait, 2015) or GI tracttoxicity (mainly diarrhea) as DLT (Dombret, 2014; Herait, 2015).

The frequency and caliber of safety assessments proposed for CompoundA-ST001 are typical of those expected for a FIH study and consistentwith findings on toxicological studies of Compound A in rats and dogs.In rats and dogs, the primary target tissues of toxicity were the GItract, bone marrow, lymphoid organs, and testes. The overallpre-clinical and the histopathology data suggest that the GI system maybe the key target of Compound Amediated toxicity.

Frequent early monitoring of subjects' weight, hydration status, serumelectrolytes, the incidence and severity of diarrhea and emesis, as wellas episodes of abdominal pain (gastric, intestinal) are criticalcomponents of the safety monitoring plan and implementation ofaggressive supportive care measures for the early onset (i.e., Grade 1)of nausea, vomiting or diarrhea are highly recommended. Based on themorphologic changes, flattening of the intestinal villi, and the mucosalerosions observed in the GI tract of rats and dogs, subjects withmalabsorption syndromes, active ulcer/gastritis, or recurring episodesof GI bleeding will be excluded from enrollment. Mucosa coating agentsfor protection of esophageal/gastric mucosa will be recommended at thediscretion of the Investigator as well as monitoring subjects for GIbleeding. Subjects will be encouraged to report episodes of GIdiscomfort or pain, appetite loss, or blood in stool.

Bone marrow hypocellularity and lymphoid tissue (thymus, spleen, lymphnodes) depletion findings emphasize the importance of frequent bloodcount monitoring, with platelets and white blood cell (WBC)differential. Subjects are monitored for possible toxicity throughstandard and specialized laboratory tests including complete bloodcounts, prothrombin time (PT)/activated partial thromboplastin time(APTT)/international normalized ratio (INR), and serum chemistries.

Transient changes in blood glucose were observed in only a few occasionsin the nonclinical toxicology studies with Compound A. Furthermore,preliminary clinical data of a new investigational BETi, OTX015,reported 7 of 37 patients with non-leukemic hematologic malignanciesexperienced Grade 1-2 hyperglycemia and 1 patient experienced Grade 3hyperglycemia (Thieblemont, 2014). It is unknown whether hyperglycemiamight be observed with Compound A in humans and the standard laboratorypanel includes fasting glucose measurements. General guidelines for themanagement of possible hyperglycemia are provided in FIG. 7.

The histopathological findings in testis- and epididymis of male ratsand dogs will warrant prohibition of semen donation and fatheringchildren for the duration of the clinical study as well as for at least3 mos after the last study dose. There were no histologic lesions inreproductive organs of female animals in the nonclinical studies. Thesignificance of this preclinical finding and the potential and relativeclinical risk is unknown at this time. Developmental and reproductivetoxicology studies have not been conducted with Compound A. Subjects arerequired to follow the pregnancy prevention guidelines as describedherein.

As this is a FIH study, subjects with a history of heart failure,ischemic heart disease, uncontrolled hypertension, serious cardiacarrhythmias, or long QT interval on ECG are excluded from enrollment.All study subjects require documentation of adequate left ventricularejection fracture (>45%) at baseline

As detailed herein, the study is conducted in two parts: dose escalation(Part A) and dose expansion (Part B).

In Part A, a Bayesian logistic regression model (BLRM) utilizingescalation with overdose control (EWOC) guides dose escalations to anestimated MTD for Compound A. Babb 1998, Neuenschwander 2008.Traditional escalation designs (e.g., 3+3, rolling six, acceleratedtitration) were designed for cytotoxic agents and doses escalationdecisions were based on toxicity rates with the underlying assumptionthat efficacy and toxicity increase with dose. Newer molecular targetingagents may have differing dose-toxicity and dose-efficacy curves and adesign based on utilizing more than just toxicity data may be moreeffective in determining the recommended dose. Tourneau et al., 101 J.Natl. Cancer Inst. 708 (2009); Ivy et al., 16 Clin. Cancer Res. 1726(2010).

The statistical model based approach (BLRM with EWOC) allows fornonclinical data to be utilized in combination with observed clinicaldata (e.g, toxicities, pharmacodynamic, pharmacokinetic, efficacy, etc.)in the assignment of each subject to a dose level and can potentiallydecrease the number of subjects treated at subtherapeutic or intolerabledoses. Tourneau et al., 7 PLoS ONE e51039 (2012). The use of EWOCprovides rules or restrictions to avoid dosing beyond the MTD.Additional details of the design are presented below. One or more dosingregimens and/or disease subsets may be selected for cohort expansion inPart B to obtain additional safety and efficacy information for largercohorts of subjects (up to about 20 in each cohort).

Based on the doses and exposures at which the principaltreatment-related effects occurred in the GLP-compliant, 4-week rat anddog studies, both species are considered of similar sensitivity to thetoxicities associated with Compound A administration. The proposed humanstarting dose is 15 mg Compound A base, once daily for 3 consecutivedays followed by 4 consecutive days off drug every week (3/7 day doseschedule). This Compound A dose was calculated using the approachdescribed in the ICH Harmonised Tripartite Guideline S9, Nonclinicalevaluation for anticancer pharmaceuticals (2009), and is summarized inTable 3:

TABLE 3 Proposed Clinical Starting Dose of Compound A Based on theSeverely Toxic Dose in 10% of the Rats and the Highest Non-severelyToxic Dose in the One-Month Toxicity Study in Dogs Rat STD10 or DogHED/Safety Proposed Clinical HNSTD HED HED Safety Factor Starting DoseSpecies (mg base/kg) (mg base/kg) (mg base/kg) Factor (mg base)^(a) (mgbase)^(b) Rat 20 3.2 194 10 19 15 Dog 3.75 2.1 125 6 21 HED = humanequivalent dose; HNSTD = highest non-severely toxic dose; STD10 =severely toxic dose in 10% of the animals. ^(a)Based on HED conversionfactor for a 60-kg person from the FDA Guidance for Industry, Estimatingthe Maximum Safe Starting Dose in Initial Clinical Trials forTherapeutics in Adult Healthy Volunteers (FDA, 2005) and the ICH S9Guideline, Nonclinical Evaluation for Anticancer Pharmaceuticals (ICH,2009). ^(b)Using allometry derived plasma clearance (mL/h/kg) and volumeof distribution (L/kg) estimates and assuming X% oral bioavailability(based on the average from preclinical species), the predicted C_(max)and AUC_(24 h) at the intended human starting dose of 15 mg areapproximated. See also CDER, Guidance for Industry: Estimating themaximum safe starting dose in initial clinical trials for therapeuticsin adult healthy volunteers (July 2005).

The proposed starting dose in humans is lower than 1/10th the STD10 inrats, less than ⅙th the HNSTD in dogs, and is considered safe based onmultiples of exposure (as measured by AUC) in rats and dogs relative tothe predicted human exposure at a dose of 15 mg Compound A base. Asnoted in Table 1, the human exposure at 15 mg base is predicted to rangefrom 736 to 2263 ng-hr/mL; these values are approximately 23-fold to72-fold lower than the mean exposure corresponding to the rat STD10(52800 ng-hr/mL) and approximately 4-fold to 14-fold lower than the meanexposure corresponding to the dog HNSTD (10000 ng-hr/mL). Based on thesetoxicokinetic data, the proposed human starting dose of 15 mg Compound Abase is expected to be safe.

A key exploratory objective of this study is to identify a dose ofCompound A that is not only safe but that exhibits pharmacologicactivity. A set of genes has been identified whose expression isdecreased upon ex vivo treatment with Compound A in peripheral bloodmononuclear cells (PBMCs) and in whole blood. In the present study,changes in the expression of these genes in whole blood or other genesin tumor biopsy may provide confirmation that a dose ispharmacologically active and could help distinguish which dose shows themost compelling pharmacologic activity.

Predictive biomarkers allow prospective identification of patients whoare likely to benefit clinically from Compound A as a single agent orcombined with other agents. Although the predictive diagnostic analysesin the current trial are exploratory in nature, they reveal associationsbetween biomarkers and responses that could provide a basis for futurediagnostically driven studies.

Different tumor types are selected for the Compound A dose expansioncohorts in Part B depending on the results from Part A of the study,pre-clinical efficacy, and supportive literature. As a reversibleinhibitor of BET family members, an expansion cohort of subjects withlocally advanced basal cell carcinoma (BCC) is enrolled in Part B.

BRD4 and other BET bromodomain proteins regulate GLI1 transcriptiondownstream of SMO, with BRD4 directly occupying GLI1 and GLI2 promoters.Tang, 2014. This occupancy can be inhibited by BET inhibitors, and theBET inhibitor, JQ1, decreases tumor cell proliferation in vitro and invivo in Hh-driven tumors, even those resistant to SMO inhibition. Tang,2014. Hence clinical investigation of a BET inhibitor in locallyadvanced or metastatic BCC subjects with de novo or acquired resistanceis warranted. Similarly, the clinical investigation of the BET inhibitorCompound A for antineoplastic activity in a variety of malignancies iswarranted. This Example provides a study of Compound A in humans,designed to evaluate drug safety and pharmacokinetic profiles withvarious dose levels/regimens, and also detects initial signals of drugefficacy in order to advance development of Phase 2 clinical trials.

More specifically, a study of Compound A includes an open-label, Phase1a, dose escalation and expansion, First-In-Human (FIH) clinical studyof Compound A in subjects with advanced solid tumors, or relapsed orrefractory NHLs. The dose escalation part of the study (Part A) exploresescalating oral doses of Compound A to estimate the MTD and/or RPTD ofCompound A. A BLRM utilizing EWOC (see Babb, 1998; Neuenschwander 2008)helps guide Compound A dose escalation decisions with the finaldecisions made by a scientific review committee (SRC). The expansionpart of the study (Part B) further evaluates the safety and efficacy ofCompound A administered at or below the MTD in a selected expansioncohorts of up to approximately twenty evaluable subjects, each in orderto further define the RP2D. One or more dosing regimens or diseasesubsets may be selected for cohort expansion. Parts A and B consist ofthree periods: Screening, Treatment, and Follow-up periods (see FIG. 4).Study Objectives are summarized in Table 1, and Study Endpoints aresummarized in Table 2, above.

Typically, the screening period starts 28 days prior to first dose ofCompound A. The informed consent document (ICD) is signed and dated bythe subject and the administering staff prior to the start of any otherstudy procedures. All screening tests and procedures are completedwithin the 28 days prior to the first dose of Compound A.

During the treatment period, formulations comprising Compound A isinitially administered orally once daily for 3 consecutive days followedby 4 consecutive days off drug every week (3/7-day dose schedule) ineach four-week cycle. Alternate dosing schedules (e.g.,2-days-on/5-days-off, each week) are examined based on the SRC review ofavailable safety, PK, pharmacodynamic (PD), and efficacy data. In PartA, the window for evaluation of dose-limiting toxicity (DLT) is 28 days(4 weeks) during Cycle 1.

In the follow-up period, all subjects are followed for 28 days (±2 days)for safety, after the last dose of Compound A. Subjects who discontinuetreatment for reasons other than disease progression (or relapse), startof a new anticancer therapy, or withdrawal of consent from the entirestudy, have disease assessments performed according to the specifiedtumor assessment schedule until progression or initiation of newsystemic anticancer therapies. After the safety follow-up visit, allsubjects are followed every subsequent 3 mos (±2 wks) for survivalfollow-up for up until 2 yrs or until death, lost to follow-up, or theend of trial, whichever occurs first.

For Part A, Dose Escalation, a minimum of 3 subjects are enrolled ateach dose level. The initial Compound A dose is 15 mg. The BLRM withEWOC incorporates available prior safety information and updates themodel parameters after each new cohort of subjects completes Cycle 1.The decision for the next dose is made by the SRC based on a calculationof risk assessment using the BLRM, and available safety (i.e., DLT andnon-DLT safety data), PK, PD, and efficacy information. In addition,relevant non-clinical data (e.g., GLP toxicity studies, in vivopharmacology from xenograft models, etc.) may be utilized in theassessment. Details of the statistical methodology are provided below.

At all decision time points, the BLRM permits alterations in the doseincrements based on the observed DLTs. The dose for the next cohort,however, does not exceed a 100% increase from the prior dose. The MTD isthe highest dose that is unlikely (<25% posterior probability) to causeDLT in ≥33% of the treated subjects in the first cycle of Compound Atreatment. The SRC makes the final decision regarding the Compound Adose for each cohort.

During dose escalation, a Compound A dose can be declared the MTD and/orRP2D after meeting the following conditions: at least six evaluablesubjects have been treated at the dose; the posterior probability oftargeted toxicity at the dose exceeds 60% and is the highest among theescalation doses or a minimum of 21 subjects have been treated on thestudy; and the dose is recommended according to the BLRM and the SRCapproves it.

The SRC includes Investigators (or designated representatives), theSponsor's study physician, safety physician, study statistician, and thestudy manager. Ad hoc attendees may include the study pharmacokineticistand additional study clinical scientists. Other internal and externalexperts are consulted by the SRC, as necessary.

The decision to evaluate additional subjects within a dose cohort, ahigher dose cohort, intermediate dose cohorts, smaller dose increments,alternate dosing schedules (e.g., 2-days-on/5-days-off, each week), ordeclare an MTD, is also determined by the SRC based on the BLRMassessment and their review of available safety (i.e., DLT and non-DLTdata), PK, PD, and efficacy information. The final decision is made bythe SRC.

After the first dose is administered in any cohort during doseescalation, subjects in each cohort are observed for 28 days (Cycle 1,DLT window) before the next dose cohort can begin. No more than onesubject per day is enrolled in a given dose escalation cohort. Subjectsnon-evaluable for DLT are replaced. A subject evaluable for DLT isdefined as one that: Has received at least 10 of 12 doses (or ≥80% ofthe total planned dose intensity) of Compound A during Cycle 1 withoutexperiencing a DLT; or Experienced a DLT after receiving at least onedose of Compound A.

Intra-subject dose escalation is not allowed during the DLT assessmentperiod. In Cycles ≥3, however, subjects without evidence of diseaseprogression who are tolerating their assigned dose of Compound A may (atthe Investigator's discretion and in consultation with the study'smedical monitor) escalate to the highest dose level shown to beadequately tolerated by at least one cohort of subjects in this study(i.e., when overdose risk is less than 25% based on the BLRMassessment).

Regarding Part B-Cohort Expansion, following completion of doseescalation (Part A), selected tumor cohorts are enrolled into anexpansion phase (Part B) with up to approximately 20 evaluable subjectseach. Expansion may occur at the MTD and schedule established in thedose escalation phase, or at an alternative tolerable dose and schedule,based on review of available safety, PK, PD, and efficacy data from PartA. The SRC selects the doses and schedules of interest for cohortexpansion. One or more dosing regimens may be selected for cohortexpansion. The SRC continues reviewing safety data regularly throughoutthe study, and recommends study continuation and dose modification, asappropriate.

Regarding enrollment of the study population, men and women, 18-years orolder, with advanced or unresectable solid tumors and relapsed orrefractory NHLs (DLBCL and iNHL) are enrolled in the study. Enrollmentis expected to take ˜30 mo to complete (12-18 mo for dose escalation and9-12 mo for expansion). Completion of active treatment andpost-treatment follow-up is expected to take an additional 4-28 mo. Theentire study is expected to last approximately 4 years. The End-of-Trialis defined as either the later date of the last visit of the lastsubject to complete the post-treatment follow-up, or the date of receiptof the last data point from the last subject that is required forprimary, secondary or exploratory analysis, as pre-specified.

Study treatment may be discontinued if there is evidence of clinicallysignificant disease progression, unacceptable toxicity orsubject/physician decision to withdraw. Subjects may continue to receivestudy drug beyond disease progression at the discretion of theInvestigator in consultation with the Medical Monitor.

In at least one embodiment, Compound A is formulated tablets for oraladministration. Labeling is appropriate, e.g., for investigational useas per the regulations of the relevant country health authority.

For key efficacy assessments, subjects are evaluated for efficacy afterevery two cycles through Cycle 6, and thereafter every three cycles. Allsubjects who discontinue treatment for reasons other than diseaseprogression, start of a new anticancer therapy, or withdrawal of consentfrom the entire study are followed until progression or initiation ofnew systemic anticancer therapies.

Tumor response is determined by the Investigator. For solid tumors,assessment is based on Response Evaluation Criteria in Solid Tumors(RECIST 1.1). Eisenhauer et al., 45 Eur. J. Cancer 228 (2009). For NHLs,assessment is based on the International Working Group Revised ResponseCriteria for Malignant Lymphoma. Cheson et al., 25 J. Clin. Oncol. 579(2007). [18F]-fluorodeoxyglucose (FDG) positron emission tomography(PET) or FDG PET/CT imaging is required to confirm a complete responsein subjects with FDG-avid tumors.

The safety variables for this study include adverse events, safetyclinical laboratory variables, 12-lead electrocardiograms, EasternCooperative Oncology Group Performance Status, left ventricular ejectionfraction assessments, physical examinations, vital signs, exposure tostudy treatment, assessment of concomitant medications, and pregnancytesting for females of child bearing potential. The PK profiles ofCompound A are determined from serial blood collections.

No clinical studies have been conducted with Compound A and thereforethe efficacy and safety profiles of Compound A in humans are unknown.Potential toxicities for Compound A are being identified based onnonclinical studies with Compound A. The frequency and caliber of safetyassessments proposed for Compound A-ST-001 are typical of those expectedfor a FIH study and consistent with findings on toxicologic studies ofCompound A in rats and dogs. In rats and dogs, the primary targettissues of toxicity were the GI tract, bone marrow, lymphoid organs, andtestes. The overall pre-clinical and the histopathology data suggestthat the gastrointestinal system may be the key target of CompoundA-mediated toxicity.

Frequent early monitoring of subjects' weight, hydration status, serumelectrolytes, the incidence and severity of diarrhea and emesis, as wellas episodes of abdominal pain (gastric, intestinal) are components ofthe safety monitoring plan and implementation of aggressive supportivecare measures for the early onset (i.e., Grade 1) of nausea, vomiting ordiarrhea are recommended. Based on the morphologic changes, flatteningof the intestinal villi, and the mucosal erosions observed in the GItract of rats and dogs, subjects with malabsorption syndromes, activeulcer/gastritis, or recurring episodes of GI bleeding may be excludedfrom the study. Mucosa coating agents for protection ofesophageal/gastric mucosa are recommended at the discretion of theInvestigator, as well as monitoring subjects for GI bleeding. Subjectsare encouraged to report episodes of GI discomfort or pain, appetiteloss, or blood in stool.

In a FIH study, subjects with a history of heart failure, ischemic heartdisease, uncontrolled hypertension, serious cardiac arrhythmias, or longQT interval on ECG may be excluded from enrollment. All study subjectsrequire documentation of adequate left ventricular ejection fracture(>45%) at baseline. Waivers to the protocol are not granted during theconduct of this trial, under any circumstances.

Bone marrow hypocellularity and lymphoid tissue (thymus, spleen, lymphnodes) depletion findings emphasize the importance of frequent bloodcount monitoring, with platelets and WBC differential. Subjects shouldbe monitored for possible toxicity through standard and specializedlaboratory tests including complete blood counts, prothrombin time(PT)/partial thromboplastin time (PTT)/international normalized ratio(INR), and serum chemistries.

The histopathological findings in testis- and epididymis of male ratsand dogs warrant the prohibition of semen donation and fatheringchildren for the duration of the clinical study as well as for at least3 months after the last study dose. There were no histologic lesions inreproductive organs of female animals in the nonclinical studies,although the significance of this was unknown. Developmental andreproductive toxicology studies have not been conducted with Compound A.Subjects will be required to follow the pregnancy prevention guidelines.

Pharmacodynamic (PD) assessments are described below. A primaryobjective of this study evaluates the safety and tolerability oftreatment with pharmaceutical formulations comprising Compound A,including the determination of the MTD or RP2D. The analysis method forestimating the MTD is the BLRM guided by the EWOC principle (Babb, 1998;Neuenschwander, 2008).

Statistical analyses are performed by dose level (Part A) and tumorcohort (Part B) as needed or applicable. Analyses are descriptive innature. Summaries of safety data are conducted using subjects receivingany Compound A (the Treated Population). Study data is summarized fordisposition, demographic and baseline characteristics, exposure,efficacy, safety, PK, and PD. Categorical data is summarized byfrequency distributions (number and percentages of subjects) andcontinuous data is summarized by descriptive statistics (mean, standarddeviation, median, minimum, and maximum).

Treatment-emergent adverse events (TEAEs) are summarized by NationalCancer Institute Common Terminology Criteria for Adverse Event grades.The frequency of TEAEs is tabulated by Medical Dictionary for RegulatoryActivities system organ class and preferred term. Grade 3 or 4 TEAEs,TEAEs leading to discontinuation of Compound A, study drug relatedTEAEs, and SAEs are tabulated separately. Changes from baseline inselected laboratory analytes, vital signs, 12-lead ECGs, and ECHO/MUGAscans are summarized. All data is presented in by-subject listings.

The primary efficacy variable is DCR. Because the compound MoA mayresult in SDs and Disease control, however, PFS and OS may serve asadditional efficacy assessments. Although OS and PFS are not usuallyassessed in FIH, Compound A administration may result in SDs andResponses (e.g., in NHL pts). Disease control is defined as tumorresponses of CR, PR and SD (assessed by the Investigators). Pointestimates and 95% confidence intervals of DCR are reported. Theobjective response rate (defined as the percentage of subjects whosebest response is complete response or partial response), duration ofresponse/stable disease, progression-free survival, and overallsurvival, is summarized using frequency tabulations for categoricalvariables or descriptive statistics for continuous variables. Efficacyanalysis is repeated for the Treated Population and Efficacy EvaluablePopulation (subjects who received a baseline disease assessmentevaluation, at least one cycle of study treatment, and one on-studydisease assessment evaluation), with the result using the TreatedPopulation considered primary.

During the Part A dose escalation, approximately 30 to 40 subjects areenrolled. During the Part B dose expansion, at least 14 efficacyevaluable subjects for each tumor cohort are accrued initially. If theresponse rate is 20% or more, there is more than a 95% chance that oneor more responders would be observed in the first 14 subjects, to beupdated by statistics based on change to DCR as a primary efficacyendpoint. Gehan, 1961. If no responder is observed out of 14 subjects,the enrollment for this tumor cohort is stopped for futility. Otherwise,the tumor cohort is expanded to up to ˜20 subjects if a responder isobserved.

More specifically, Compound A is assessed in an open-label, Phase 1a,dose escalation and expansion, FIH clinical study in subjects withadvanced solid tumors and relapsed or refractory NHLs. The doseescalation part (Part A) of the study explores escalating oral doses ofCompound A to estimate the MTD or RPTD of Compound A. A BLRM utilizingEWOC (Babb, 1998; Neuenschwander 2008) helps guide Compound A doseescalation decisions with the final decisions made by a scientificreview committee (SRC). The expansion part (Part B) further evaluatesthe safety and efficacy of Compound A, administered at or below the MTDin selected expansion cohorts of up to ˜20 evaluable subjects each, inorder to further define the RP2D. One or more dosing regimens and/ordisease subsets may be selected for cohort expansion. Parts A and B willconsist of 3 periods: Screening, Treatment, and Follow-up periods (seeFIG. 4).

As noted, the screening period starts 28 days prior to first dose ofCompound A. The informed consent document (ICD) is signed and dated bythe subject and the administering staff prior to the start of any otherstudy procedures. All screening tests and procedures must be completedwithin the 28 days prior to the first dose of Compound A. During thetreatment period, Compound A is initially administered orally once dailyfor three consecutive days followed by four consecutive days off drugevery week (3/7 day dose schedule) in each 4-weekcycle. Alternate dosingschedules (e.g., 2-days-on/5-days-off, each week) may be examined basedon the review of available safety, PK, PD, and efficacy data by the SRC.In Part A, the window for evaluation of dose-limiting toxicity (DLT) is28 days (4 weeks) during Cycle 1. In the follow-up period, all subjectsare followed for 28 days (±2 days) after the last dose of Compound A forsafety. Subjects who discontinue treatment for reasons other thandisease progression (or relapse), start of a new anticancer therapy, orwithdrawal of consent from the entire study will have diseaseassessments performed according to the specified tumor assessmentschedule until progression and/or initiation of new systemic anticancertherapies. After the safety follow-up visit, all subjects are followedevery subsequent 3 months (±2 weeks) for survival follow-up for up until2 years or until death, lost to follow-up, or the end of trial,whichever occurs first.

Regarding Part A, Dose Escalation, a minimum of 3 subjects are enrolledat each dose level. The initial Compound A dose is 15 mg. The BLRM withEWOC incorporates available prior safety information and update themodel parameters after each new cohort of subjects completes Cycle 1.The decision for the next dose is made by the SRC based on a calculationof risk assessment using the BLRM, and available safety (i.e., DLT andnon-DLT safety data), PK, PD, and efficacy information. In addition,relevant non-clinical data (e.g., GLP toxicity studies, in vivopharmacology from xenograft models, etc.) may be utilized in theassessment. Details of the statistical methodology are provided inAppendix H.

At all decision time points, the BLRM permits alterations in the doseincrements based on the observed DLTs; however, the dose for the nextcohort does not exceed a 100% increase from the prior dose. The MTD isthe highest dose that is unlikely (<5% posterior probability) to causeDLT in ≥33% of the treated subjects in the first cycle of Compound A.The SRC makes the final decision regarding the Compound A dose for eachcohort.

During dose escalation, a Compound A dose can be declared the MTD and/orRP2D after meeting the following conditions: at least six evaluablesubjects have been treated at the dose; the posterior probability oftargeted toxicity at the dose exceeds 60% and is the highest among theescalation doses or a minimum of 21 subjects have been treated on thestudy; the dose is recommended according to the BLRM and the SRCapproves it.

The SRC includes Investigators (and/or designated representatives), theSponsor's study physician, safety physician, study statistician, and thestudy manager. Ad hoc attendees may include the study pharmacokineticistand additional study clinical scientists. Other internal and externalexperts may be consulted by the SRC, as necessary.

The decision to evaluate additional subjects within a dose cohort, ahigher dose cohort, intermediate dose cohorts, smaller dose increments,alternate dosing schedules (e.g., 2 days on/5 days off each week), ordeclare an MTD will also be determined by the SRC, based on the BLRMassessment and their review of available safety (i.e., DLT and non-DLTdata), PK, PD, and efficacy information.

After the first dose is administered in any cohort during doseescalation, subjects in each cohort are observed for 28 days (Cycle 1,DLT window) before the next dose cohort can begin. No more than onesubject per day is enrolled in a given dose escalation cohort. Thosesubjects non-evaluable for DLT are replaced. A subject evaluable for DLTis defined as one that has received at least 10 of 12 doses (or ≥80% ofthe total planned dose intensity) of Compound A during Cycle 1 withoutexperiencing a DLT; or Experienced a DLT after receiving at least onedose of Compound A.

Intra-subject dose escalation is not allowed during the DLT assessmentperiod. In Cycles ≥3, however, subjects without evidence of diseaseprogression who are tolerating their assigned dose of Compound A may (atthe Investigator's discretion and in consultation with the study'smedical monitor) escalate to the highest dose level shown to beadequately tolerated by at least one cohort of subjects in this study(i.e., overdose risk is less than 25% based on the BLRM assessment).

Regarding Part B, Cohort Expansion, following completion of doseescalation (Part A), selected tumor cohorts are enrolled into anexpansion phase (Part B) with up to approximately twenty evaluablesubjects each. Expansion may occur at the MTD and schedule establishedin the dose escalation phase, or at an alternative tolerable dose andschedule, based on review of available safety, PK, PD, and efficacy datafrom Part A. The SRC selects the doses and schedules of interest forcohort expansion. One or more dosing regimens may be selected for cohortexpansion. The SRC continues to review safety data regularly throughoutthe study and make recommendations about study continuation and dosemodification, as appropriate.

A schedule of assessments is shown in Table 4 and assessments aredescribed below. The safety variables for this study include adverseevents, safety clinical laboratory variables, 12-leadelectrocardiograms, Eastern Cooperative Oncology Group PerformanceStatus, left ventricular ejection fraction assessments, physicalexaminations, vital signs, exposure to study treatment, assessment ofconcomitant medications, and pregnancy testing for females of childbearing potential. Subjects are evaluated for efficacy after every 2cycles through Cycle 6, and thereafter every 3 cycles. All subjects whodiscontinue treatment for reasons other than disease progression, startof a new anticancer therapy, or withdrawal of consent from the entirestudy will be followed until progression and/or initiation of newsystemic anticancer therapies.

Blood is collected at specified time-points for determining the PKprofiles of Compound A and for exploratory PD assessments. Paired tumorbiopsies for analysis of biomarkers of treatment activity are optionalin the dose escalation phase but mandatory during the dose expansionphase.

The study is conducted in compliance with the International Council onHarmonisation (ICH) of Technical Requirements for Registration ofPharmaceuticals for Human Use/Good Clinical Practice (GCP) andapplicable regulatory requirements.

Enrollment may take ˜30 mo to complete (12-18 mo dose escalation and9-12 mo expansion). Completion of active treatment and post-treatmentfollow-up is expected to take an additional 4-28 mo. The entire study isexpected to last ˜4 yr.

The End of Trial is defined as either the date of the last visit of thelast subject to complete the post-treatment follow-up, or the date ofreceipt of the last data point from the last subject that is requiredfor primary, secondary and/or exploratory analysis, as pre-specified inthe protocol, whichever is the later date.

This Example proposes a multicenter, open-label study in whichapproximately 30 to 40 subjects are enrolled during Part A (doseescalation). During the Part B (dose expansion), up to 20 evaluablesubjects are enrolled in each of the selected dose expansion cohorts.Enrollment occurs at approximately 4-6 sites in Europe for Part A.Enrollment in Part B may include additional sites in the United Statesand Europe.

Regarding inclusion criteria, subjects must satisfy the criteria belowto be enrolled in dose escalation (Part A) of this study:

-   -   1. Men and women ≥18 years of age, the time of signing the        informed consent document (ICD);    -   2. Subject must understand and voluntarily sign an ICD prior to        any study-related assessments/procedures being conducted;    -   3. Subject is willing and able to adhere to the study visit        schedule and other protocol requirements;    -   4. Subjects with histological or cytological confirmation of        advanced unresectable solid tumors or iNHL (DLBCL and iNHL)        including those who have progressed on (or not been able to        tolerate due to medical comorbidities or unacceptable toxicity)        standard anticancer therapy or for whom no other approved        conventional therapy exists;    -   5. At least one site of measurable disease (≥1.5 cm in the long        axis or >1.0 cm in both the long and short axis) must be present        in subjects with solid tumors and iNHL;    -   6. Subject consents to mandatory tumor biopsies (Screening and        Cycle 1) in Part B. Tumor biopsies are optional in Part A;    -   7. ECOG Performance Status of 0 to 1;    -   8. Subjects must have the following laboratory values at        screening: (a) Absolute neutrophil count (ANC)≥1.5×10⁹/L without        growth factor support for 7 days (14 days if subject received        pegfilgrastim); (b) Hemoglobin (Hgb)≥9 g/dL (≥8 g/dL for NHL        subjects); (c) Platelet count (plt)≥75×10⁹/L (≥50×10⁹/L without        transfusion for 7 days for NHL subjects); (d) Serum potassium        concentration within normal range, or correctable with        supplements; (e) Serum AST/SGOT and ALT/SGPT≤3.0×Upper Limit of        Normal (ULN) or ≤5.0×ULN if liver metastases are present; (f)        Serum total bilirubin ≤1.5×ULN or ≤2×ULN if liver metastases are        present; (g) Serum creatinine ≤1.5×ULN, or 24-hour measured        creatinine clearance ≥50 mL/min using the CockcroftGault        equation; (h) Subjects with documented liver metastases must        have serum albumin ≥3 g/dL; and (i) INR<1.5×ULN and PTT<1.5×ULN;    -   9. Females of childbearing potential (FCBP) must: (A) Either        commit to true abstinence from heterosexual contact (which must        be reviewed on a monthly basis and source documented) or agree        to use, and be able to comply with, at least two effective        contraceptive methods (oral, injectable, or implantable hormonal        contraceptive; tubal ligation; intra-uterine device; barrier        contraceptive with spermicide; or vasectomized partner), one of        which must be barrier, from signing the ICD, throughout the        study, and for up to 28 days or up to 3 months following the        last dose of Compound A; and (B) Have two negative pregnancy        tests as verified by the Investigator prior to starting Compound        A: a negative serum pregnancy test (sensitivity of at least 25        mIU/mL) at Screening; a negative serum or urine pregnancy test        (Investigator's discretion) within 72 hr prior to Cycle 1 Day ˜1        of study treatment; (C) Avoid conceiving for 3 mo after the last        dose of Compound A; (D) Agree to ongoing pregnancy testing        during the course of the study, and after the end of study        treatment. This applies even if the subject practices true        abstinence from heterosexual contact; and    -   10. Males must practice true abstinence (which must be reviewed        on a monthly basis) or agree to use a condom (a latex condom is        recommended) during sexual contact with a pregnant female or a        FCBP and will avoid conceiving from signing the ICD, while        participating in the study, during dose interruptions, and for        at least 3 month following Compound A discontinuation, even if        he has undergone a successful vasectomy.

A female of childbearing potential is a sexually mature woman who (1)has not undergone a hysterectomy (the surgical removal of the uterus) orbilateral oophorectomy (the surgical removal of both ovaries) or (2) hasnot been naturally postmenopausal for at least 24 consecutive mo (e.g.,has had menses at any time during the preceding 24 consecutive mo). Trueabstinence is acceptable when this is in line with the preferred andusual lifestyle of the subject. Periodic abstinence (e.g., calendar,ovulation, symptothermal, post-ovulation methods) and withdrawal are notacceptable methods of contraception.

The presence of any of the following excludes a subject from enrollment:

-   -   (1) Subject has received anti-cancer therapy (either approved or        investigational) within ≤4 weeks or 5 half-lives, whichever is        shorter, prior to signing the ICD;    -   (2) Toxicities resulting from prior systemic cancer therapies        must have resolved to ≤NCI CTCAE Grade 1 prior to starting        Compound A treatment. Peripheral neuropathy ≥NCI CTCAE Grade 2;    -   (3) Subject has received autologous hematologic stem cell        transplant (HSCT)≤3 mo or allogenic HSCT≤6 mo prior to starting        Compound A treatment: the 6-mo exclusionary period for recovery        from HSCT-associated toxicity, applies regardless of whether an        autologous or allogeneic transplant was performed;    -   (4) Subject has undergone major surgery ≤4 wk or minor surgery        ≤2 wk prior to signing the ICD or who have not recovered from        surgery;    -   (5) Subject has completed any radiation treatment <4 wk prior to        signing the ICD; (6) Subject has persistent diarrhea due to a        malabsorptive syndrome (such as celiac sprue or inflammatory        bowel disease)≥NCI CTCAE Grade 2, despite medical management, or        any other significant GI disorder that could affect the        absorption of Compound A;    -   (7) Subjects with symptomatic or uncontrolled ulcers (gastric or        duodenal), particularly those with a history of and/or risk of        perforation and GI tract hemorrhages;    -   (8) Symptomatic or unstable central nervous system metastases:        Subjects recently treated with whole brain radiation or        stereotactic radiosurgery for CNS metastases must have completed        therapy at least 4 wk prior to Cycle 1, Day 1 and have a        follow-up brain CT or MRI demonstrating either stable or        improving metastases 4 or more wk after completion of        radiotherapy (the latter to be obtained as part of the Screening        Assessments);    -   (9) High grade, rapidly proliferative solid tumors (e.g., small        cell lung cancer, germ cell tumors, neuroblastoma) with        extensive tumor burden (>10 cm in sum of diameters of measurable        lesions) and LDH>ULN;    -   (10) Known symptomatic acute or chronic pancreatitis;    -   (11) Impaired cardiac function or clinically significant cardiac        diseases, including any of the following: LVEF<45% as determined        by multiple gated acquisition scan (MUGA) or echocardiogram        (ECHO); Complete left bundle branch or bifascicular block;        Congenital long QT syndrome; Persistent or clinically meaningful        ventricular arrhythmias or atrial fibrillation; QTcF≥470 msec on        Screening ECG (mean of triplicate recordings); Unstable angina        pectoris or myocardial infarction ≤6 mo prior to starting        Compound A; Other clinically significant heart disease such as        congestive heart failure requiring treatment or uncontrolled        hypertension (blood pressure ≥160/95 mm Hg);    -   (12) Pregnant or nursing females;    -   (13) Known HIV infection;    -   (14) Known chronic active hepatitis B or C virus (HBV, HCV)        infection: Subjects who are seropositive due to HBV vaccination        are eligible; Subjects who have no active viral infection and        are under adequate prophylactics against HBV reactivation are        eligible; Allowance for HCC with respect to HCV may be        considered;    -   (15) Ongoing treatment with chronic, therapeutic dosing of        anti-coagulants (e.g., warfarin, low molecular weight heparin,        Factor Xa inhibitors). Low dose low molecular weight heparin for        catheter maintenance are permitted;    -   (16) History of concurrent second cancers requiring active,        ongoing systemic treatment;    -   (17) Subjects with a history of clinically significant cognitive        disorder(s) or active cognitive disorder(s);    -   (18) Subject has any significant medical condition (e.g., active        or uncontrolled infection or renal disease), laboratory        abnormality, or psychiatric illness that would prevent the        subject from participating (or compromise compliance) in the        study or would place the subject at unacceptable risk if he/she        were to participate in the study;    -   (19) Subjects with a history of clinically significant cognitive        disorder(s) or active cognitive disorder(s); and    -   (20) Subject has any condition that confounds the ability to        interpret data from the study.

Regarding procedures, questions regarding the protocol should bedirected to the Medical Monitor or designee. The procedures conductedfor each subject enrolled in the study are outlined in Table 4:

TABLE 4 Events Follow-up Treatment Period Period Screening Cycle 1Cycles 2-4 Cycles 5+ Safety^(b) Long Term D −28 WK 1 WK 2 WK 3 WK 4 WK 1WK 2 WK 3 WK 4 WK 1 WK 3 EOT 28 D q3 mo Event^(a) to −1 D 1 D 2 D 3 D 8D 15 D 22 D 1 D 8 D 15 D 22 D 1 D 15 ≤28 D ±2 D (±2 wk) Study EntryInformed consent X and contraceptive counseling Informed consent X foroptional exploratory analyses/PK sampling Inclusion/ X exclusioncriteria Medical/ X oncologic history and therapies Demographics X IRTregistration X X X Prior/concomitant X X X X X X X X X X X X X X Xmedications, procedures Study Drug Administer oral X X X X X X X X X X XX Compound A per assigned dosing schedule^(d) Provide/review X X X X X XX X X X X X X diary card Safety Assessments Adverse Event X X X X X X XX X X X X X X X Evaluation Height X Weight X X X X X X X X X X X X VitalSigns X X X X X X X X X X X Physical X X X X Examination ECOG PS X X X X12-lead ECG X ≥ 72 hours X X D17 only X X X (single prior to D1 ortriplicate)^(e) LVEF X X C2 only ±7 d X C5 only ±7 d X ± 7 d (ECHO/MUGA)Pregnancy X X X X X Testing (FCBP only) Hematology X D −14 X X X X X XC2 only X X C2 only X X laboratory to −1 Chemistry X D −14 X X X X X XC2 only X X C2 only X X laboratory with to −1 LDH, uric acid tests PT,INR, PTT X D −14 X X X X X X C2 only X X C2 only X X to −1 Amylase,lipase, X X C2 only X q3 cycle X T-cell subsets C5, C8, C11 (CD4+ andCD8+), TSH Urinalysis X D −14 X X X X to −1 PK and PD Assessments Blood,PK X X X D17-18 CSF, PKf X D17 Blood (whole), X pharmaco- genomics Blood(whole), X X PAX gene for RNA Tumor Biopsy^(g) X D −7 to −1 X D16 or D17Archival tumor X tissue (FFPE) Efficacy Solid tumor/NHL X X D28 ±7 d; XD28 ± 7 d X assessments: C2, C4 In C6, then CT/MRI imaging^(h) q3cycles: end of C12, etc NHL-specific: X X D28 ±7 d in C2 X only when Xbone marrow confirming CR evaluation if known or suspected bone marrowinvolvement NHL-specific: FDG X X when PET or PET/CT confirming CR scan(not required if tumor is FDG-negative) Additional Follow-up Follow-up XX anticancer therapies SAE follow-up X Survival X follow-up Table 4. Keyβ-hCG = beta human chorionic gonadotropin; BMMC = bone marrowmononuclear cells; C = cycle; CK = creatine kinase; CSF = cerebrospinalfluid; CT = computed tomography; D = day(s); ECHO = echocardiogram; ECOGEastern Cooperative Oncology Group; FCBP = females of child bearingpotential; FFPE = formalin-fixed, paraffin embedded; fT4 = free T4; INR= international normalized ratio; IRT = integrated response technology;LVEF = left ventricular ejection fraction; mo = months; MUGA =multi-gated acquisition scan; PK = pharmacokinetic; PT = prothrombintime; PTH = parathyroid hormone; PTT = partial thromboplastin time; q =every; TSH = thyroid-stimulating hormone; WK(s) = week. ^(a) All studyvisits/procedures have a ±2 day window and all laboratory blood samplesare drawn predose unless otherwise specified. ^(b)This safety follow-upassessment may be by telephone. ^(c)Survival follow-up for up to 2 yr oruntil death, lost to follow-up, or End of Trial, whichever occurs first.May be conducted by record review (including public records) ortelephone contact with the subject, family, or treating physician.^(d)Not all Compound A dosing days are shown. Dose schedule is initially3/7 day schedule. Alternate dosing schedules may be implemented based onSRC decisions. ^(e)Screening triplicate ECG performed ≥ 72 hours priorto dosing on Day 1 so that the central read results are available forreview. ^(f)Optional for subjects with a primary or metastatic CNSlesion and a shunt or reservoir in place. Recommended time for CSFcollections is 4 hr (±1 hr) after dosing on Day 17 (or on day of lastdose of Compound A in Cycle 1). Other times for CSF collection allowedif CSF collection is on a PK day and is consistent with one of thescheduled blood PK collection times: 1-8 hr post-dose. ^(g)Paired tumorbiopsies mandatory for Part B and highly recommended for Part A.Screening biopsy obtained after all inclusion/exclusion criteria arefulfilled. The Cycle 1 biopsy obtained on Day 16 or 17 if twoconsecutive Compound A doses have been administered. ^(h)All subjectswho discontinue treatment for reasons other than disease progression,start of new anticancer therapy, or withdrawal of consent from theentire study are followed according to the specified tumor assessmentschedule until progression or initiation of new systemic anticancertherapies. ^(i)May be omitted if results are normal on subject's mostrecent historical bone marrow biopsy. Additionally, analysis omitted ifa prior analysis performed within 90 days before Cycle 1 Day 1.

All study visits have a ±2 day window unless otherwise specified belowor in the Table of Events (see Table 4). All laboratory blood samplesare drawn pre-dose unless otherwise specified (e.g., PK samples). Thestudy procedures are recorded in the source document and the electroniccase report forms (eCRF). In the event subjects fail Screening, minimalinformation is documented on the eCRFs, per database instructions.

Safety laboratory analyses may be performed locally. Screeninglaboratory values must demonstrate subject eligibility, but may berepeated within the screening window, if necessary. The ICD isadministered at the Screening visit to all subjects by qualified studystaff. It must be signed and dated by the subject and the administeringstaff prior to the start of any other study procedures and itscompletion documented in source documents and in the eCRF. All screeningtests and procedures must be completed within 28 days prior to the firstdose of Compound A according to the schedule shown in Table 4.

The following are performed at Screening, after informed consent hasbeen obtained: Inclusion and exclusion criteria are assessed atScreening and recorded in the source documents and the eCRF;Contraceptive counseling; Medical, oncologic, and surgical history, anddemographic data (including each subject's date of birth, sex, race, andethnicity) are collected during Screening as consistent with localregulations. Oncologic history includes a detailed history of theprimary diagnosis and date, therapies, and responses; Information onprior and concomitant medications and procedures is collected;Registration in the integrated response technology system (IRT); Adverseevent monitoring; Height and weight measured; Vital signs assessed;Physical examination (source documented only) and ECOG performancestatus; A 12 lead ECG in triplicate are performed ≥72 hours prior to thefirst dose of Compound A with results received from the central readprior to dosing to fulfil eligibility criteria; Left VentricularEjection Fraction (LVEF) assessment; Pregnancy testing for all femalesof childbearing potential. Appropriate methods of contraception andpotential risks of fetal exposure will be discussed with subjects duringScreening. Double contraceptive methods (one of which must be a barriermethod) for females of childbearing potential (e.g., oral, injectable,or implantable hormonal contraceptive; intra-uterine device; barriercontraceptive with spermicide; or vasectomized partner) and a singlecontraceptive method for males (a condom) must be used from the time theICD is signed, throughout the study by subjects, and for 28 days afterthe last dose of the Compound A. This is documented in source documents;Clinical laboratory tests are to be completed within the timeframe (seeTable 2); Efficacy/tumor assessments.

Qualified healthcare professionals are trained in the requirementsspecific to contraceptive counseling of subjects. Once trained thesehealthcare staff will counsel subjects prior to the administration ofCompound A to ensure that the subject has complied with all requirementsincluding use of birth control and that the subject understands therisks associated with Compound A.

During the treatment period, all concomitant medications and procedurestaken or conducted beginning when the subject signs the ICD, throughoutthe study, and until 28 days after the last dose of Compound A arerecorded in the source documents and eCRF.

Adverse events and serious adverse events (SAEs) are recorded from thetime a subject signs the ICD until 28 days after the last dose ofCompound A. Subjects experiencing AEs are monitored with relevantclinical assessments and laboratory tests, as determined by theInvestigator. Every attempt is made to document resolution dates forongoing AEs. The AEs are recorded on the AE page of the eCRF and in thesubject's source documents. Photographs of skin rashes are obtainedwhenever possible, anonymized, and stored appropriately for futureretrieval.

The subject's weight is recorded in the source document and eCRF at thevisits listed in Table 4. Vital signs include body temperature, bloodpressure, pulse rate, and respiration rate and will be recorded atScreening and during the study at various time points for safetymonitoring as described in Table 4. Recorded measurements are capturedin the source document and eCRF. Complete physical examination andEastern Cooperative Oncology Group Performance Status (ECOG PS; refer toAppendix D) will be performed at the visits listed in Table 4. Resultsfor both are recorded in the source document. Results for the ECOG PSare also be collected on the eCRF. Physical examination findings areclassified as either normal or abnormal. If abnormal, a description ofthe abnormality and clinical importance is provided in the sourcedocuments. Clinically significant changes from baseline are recorded inthe AE section of the eCRF. Triplicate standard 12-leadelectrocardiograms (ECGs) will be recorded at the visits listed in Table4. The 12-lead ECGs (12-lead at 25 mm/sec reporting rhythm, ventricularrate, PR interval, QRS complex, QT interval, and QTc interval) isperformed after the subject has been in the supine position for at least5 minutes. Triplicate ECGs (three recordings within 2±1 minuteintervals) are performed at: (a) Screening (b) Cycle 1 (c) Day 1:pre-dose (within 30 min prior to dosing) and 2 hr (±10 min) post-dose(d) Day 17: pre-dose (within 30 min prior to dosing) and 2 hr (±10 min)post-dose (e) Cycles 2 and higher: Day 1: pre-dose (within 30 min priorto dosing)

A single ECG will be performed at the EOT visit. For alternate dosingschedules, the Cycle 1 Day 17 ECGs will be performed on the last day ofCompound A dosing in Cycle 1. Investigators make immediate clinicaldecisions based on their interpretation of the ECG results and providetheir overall assessment of the ECG in the eCRF. Clinically significantchanges from baseline will be recorded in the AE section of the eCRF.The ECG outputs are also uploaded to the central ECG laboratory fordefinitive analysis and interpretation. Left ventricular ejectionfraction (LVEF), (multiple gated acquisition scan [MUGA], orechocardiogram [ECHO]) are conducted at Screening in all subjects.Follow-up assessments are required as indicated in Table 4. Follow-upassessments should use the same procedure used at the screeningassessment. A clinically significant reduction is defined as either a≥20% absolute reduction in LVEF or drop to below 45%.

A female of childbearing potential (FCBP) is defined as a sexuallymature woman who has: (a) Not undergone a hysterectomy or bilateraloophorectomy, and (b) Not been naturally postmenopausal (amenorrheafollowing cancer therapy does not rule out childbearing potential) forat least 24 consecutive mo (e.g., has had menses at any time in thepreceding 24 consecutive mo).

The Investigator classifies a female subject as a FCBP according to thisdefinition. Pregnancy testing is not required for non-FCBP subjects butjustification must be recorded in the eCRF and the source document.Pregnancy testing is conducted by the local laboratory.

Results for pregnancy tests are recorded in the source document andeCRF. For a FCBP, pregnancy testing is conducted at the visits (see alsoTable 4): (a) A serum pregnancy test with sensitivity of at least 25mIU/mL is obtained at Screening and serum or urine pregnancy test (basedon Investigator's discretion) within 72 hr prior to Cycle 1 Day ˜1 ofstudy treatment. The subject may not receive Compound A until theInvestigator has verified the 2 screening pregnancy tests are negative.(b) A serum or urine pregnancy test (based on Investigator's discretionand minimum test sensitivity [25 mIU/mL]) are done within 72 hr prior toDay 1 of every cycle and at the end of treatment (EOT) visit. Thesubject may not receive Compound A until the Investigator has verifiedthe pregnancy test is negative. (c) A FCBP or a male subject whosepartner is an FCBP must avoid activities that could lead to conceptionfor 3 mo after the last dose of Compound A.

The following laboratory assessments are performed at the Screeningvisit and during the study at the time points as described in Table 4.All samples are drawn pre-dose unless otherwise specified. Laboratoryassessments are recorded in the source document and eCRF and are thefollowing: (a) Hematology: complete blood counts (CBC) includinghemoglobin, hematocrit, WBC count with absolute differential (includingblast count) and platelet count. (b) Serum chemistry: albumin, totalprotein, bicarbonate or CO₂, magnesium, phosphorus, calcium, creatinine,urea/BUN, glucose (fasting ≥4 hr), potassium, sodium, chloride, totalbilirubin (fractionate if outside normal range), alkaline phosphatase,AST or serum glutamic oxaloacetic transaminase (SGOT), ALT or serumglutamate pyruvic transaminase (SGPT), LDH, and uric acid; baselinehemoglobin Alc in case hyperglycemia is significant based on otherBETi's in the clinic. (c) Special chemistry: amylase, lipase, T-cellsubsets (CD4+ and CD8+), thyroid-stimulating hormone (TSH; if abnormalreflex to free T4). (d) Coagulation: PT, INR, and PTT (e) Urinalysis:dipstick: microscopy in the event of a positive (1+ or greater) blood orprotein; 24-hr collection for creatinine clearance and proteinquantification in the event of 2+ or greater protein (e) Creatinineclearance determination required at Screening to fulfill inclusioncriteria.

An EOT evaluation (refer to Table 4 for procedures) is performed forsubjects who are withdrawn from treatment for any reason as soon aspossible (<28 days) after the decision to permanently discontinuetreatment has been made. All subjects are followed for 28 days after thelast dose of Compound A for AE reporting and concomitant medicationinformation. The 28-day (±2 days) safety follow-up contact may be bytelephone. In addition, any SAEs made known to the Investigator at anytime thereafter that are suspected of being related to Compound A arereported. After the Safety Follow-up visit, all subjects are followedevery subsequent 3 mo (±2 wk) for survival follow-up for up to 2 yr oruntil death, lost to follow-up, or the End of Trial, whichever occursfirst. New disease therapies should be collected at the same timeschedule. Survival follow-up may be conducted by record review(including public records) and/or telephone contact with the subject,family, or the subject's treating physician.

Regarding efficacy assessment, tumor assessments are performed atscreening and include CTs of the chest, abdomen and pelvis, and a brainscan (CT or MRI) for subjects with known or suspected cerebralinvolvement. After screening, radiologic tumor assessments are performedat the end (Day 28±7 days) of Cycles 2, 4, and 6, and then every threecycles thereafter, using the same CT/MRI scanning modalities used atScreening. An EOT scan does not need to be obtained if the prior scanwas within 28 days. Additionally, for NHL subjects, a Screening FDG PETor FDG PET/CT scan is performed unless the tumors are known to beFDG-avid negative. A subsequent scan will be obtained to confirm a CR.For NHL subjects with known or suspected bone marrow involvement, a bonemarrow evaluation with flow immunophenotyping will be performed atScreening, after two cycles (end of Cycle 2), and to confirm a completeresponse (CR).

All subjects who discontinue treatment for reasons other than diseaseprogression, start of a new anticancer therapy, or withdrawal of consentfrom the entire study are followed according to the specified tumorassessment schedule until progression or initiation of new systemicanticancer therapies. Tumor response at each post-screening assessmentis determined by Investigator, based on Response Evaluation Criteria inSolid Tumors (RECIST) v 1.1 as described in Appendix B for solid tumorsand the Revised Response Criteria for Malignant Lymphoma as described inAppendix C for NHL.

The PK assessments are described below. For evaluation of PK of CompoundA in plasma, blood samples are collected from all subjects at the timepoints listed in Table 5. The actual time of each sample collection isrecorded in the source documents and on the electronic case report forms(eCRFs). A baseline PK sample may include a collection in on Day 1 inPart B.

TABLE 5 Blood Pharmacokinetic Sampling Schedule for Cycle 1 Time inHours Part A, Part B, Relative to Collection Cycle 1 Cycle 1 Compound ADose Window Days 1 and 17^(a) Day 17^(a) 0 Within 30 X X min prior 0.5±5 min X X 1 ±5 min X X 1.5 ±5 min X X 2 ±5 min X X 3 ±10 min X X 4 ±10min X X 6 ±10 min X X 8 ±10 min X X 24 ±1 hour X X (pre Day 2 (Day 18)dosing) ^(a)For alternate dosing schedules, Day 17 blood collections forPK samples are performed on the last day of dosing in Cycle 1 at thesame time points shown.

An exploratory analysis of Compound A concentrations in CSF may beperformed for subjects who have a primary or metastatic CNS lesion witha shunt or reservoir in place and who provide consent for the optionalcollection. The recommended time for CSF collections may include asample prior to exposure, then 4 hr (±1 hr) after dosing on Day 17 (orthe last day of Compound A dosing in Cycle 1 if alternate dosingschedules are implemented). Other times for CSF collection are allowedas long as the time for CSF collections is on a PK day and is consistentwith one of the scheduled blood PK collection times between 1-8 hrpost-dose (see Table 4). The Sponsor may conduct additional analyses onthe PK samples in order to follow up the safety of the study treatmentor to better understand the progression of the disease or the disease'sresponse to the study treatment. Sample collection, handling, andprocessing follow the standard instructions of good laboratorypractices.

Regarding biomarkers, pharmacodynamics, and pharmacogenomics, archivaltumor, as formalin-fixed, paraffin-embedded (FFPE) blocks or mountedsections (15 slides recommended), are retrieved after eligible subjectsare enrolled in the IRT system unless single case exemption is grantedby the Sponsor. For pharmacogenomic blood samples, a whole blood sampleis collected at after eligible subjects are enrolled in the IRT systemfor assessment of potential pharmacogenomic markers of Compound Asafety, activity or exposure. See the Laboratory Manual and Appendix Gfor sample collection, handling, and processing instruction.

The schedules for pharmacodynamic and predictive biomarkers areprovided: (a) Whole blood for PD biomarker studies: Cycle 1 Day 1:pre-dose (≤3 hr), and 2, 4, 8, (each ±15 min) and 24 hr (±1 hr) afterthe Compound A dose (b) Tumor tissue for PD biomarker studies:Screening: Day −7 to −1 (after all inclusion and exclusion criteria arefulfilled); Cycle 1 Day 16 or 17: 2 hr (±1 hr) after the Compound Adose; and Optional, any other time until EOT visit.

The Sponsor may conduct additional analyses on the PD samples in orderto follow up the safety of the study treatment or to better understandthe progression of the disease or the disease's response to the studytreatment.

Tumor biopsies are mandatory in Part B and optional (but encouraged) inPart A. The biopsy is collected either tumor excision (preferred) or bycore needle (four passages recommended) at Screening and in Cycle 1 onDay 16 or 17. Fine needle aspiration is not sufficient as a source oftumor biopsy material. Samples may be processed as fresh frozenparaffin-embedded (FFPE). Optimally, the tumor tissue samples areobtained from the same tumor site. If Compound A has been interruptedprior to completing the Cycle 1 Day 16 or 17 dose, it is recommendedthat the tumor biopsy be deferred until after at least two consecutivedoses have been administered. Additionally, an optional tumor biopsy maybe obtained in both Part A and Part B, during later treatment cycles orfollowing treatment discontinuation (any time during the 28-dayfollow-up period) to elucidate effects of long-term treatment orresistance mechanisms, respectively. See the Laboratory Manual andAppendix G for sample collection, handling, and processing instruction.

The Investigational Product(s) is Compound A, which has a molecularweight of 464 g/mole. Compound A clinical drug product is provided as aformulation. Compound A clinical drug product should be stored asindicated on the package label.

Compound A is administered once daily in the morning on an empty stomach(i.e., ≥1 hr before breakfast) with at least 240 mL of water after anovernight fast lasting ≥6 hr in both Parts A and B. Subjects shouldabstain from food or other medication intake for ≥1 hr after each dose.Subjects will administer Compound A starting on Day 1 for 3 consecutivedays followed by four consecutive days off drug every week (3/7-day doseschedule) in each 4-week cycle. Alternate dosing schedules may beimplemented based on the review of clinical safety and laboratory databy the SRC.

On study days that require PK assessments, Compound A is administered inthe clinic after any pre-dose assessments are completed. On all otherstudy days, subjects will self-administer their assigned doses at homeand record dosing times on the study diary card.

Study treatment may be discontinued if there is evidence of clinicallysignificant disease progression, unacceptable toxicity orsubject/physician decision to withdraw. Subjects may continue to receivestudy drug beyond disease progression at the discretion of theInvestigator in consultation with the Sponsor Medical Monitor.

For the purposes of dose escalation decisions, at least three subjectsare enrolled in successive cohorts. The first cohort is treated with thestarting dose of 15 mg. Subjects must complete a minimum of one cycle oftreatment with the minimum safety evaluation and drug exposure or havehad a DLT within the first cycle of treatment to be considered evaluablefor dose escalation decisions. Dose escalation decisions will occur whenthe cohort of subjects has met these criteria. Dose escalation decisionswill be made by the SRC. Decisions will be based on a synthesis of allrelevant data available from all dose levels evaluated in the ongoingstudy including safety information, DLTs, all treatment related CTCAEgrade ≥2 toxicity data during Cycle 1, and PK, data from evaluablesubjects. PK data from subjects are made available on an on-going basisthroughout the study and dosing will be adapted accordingly. Therecommended dose for the next cohort of subjects will be guided by theBLRM with EWOC principle.

The adaptive Bayesian methodology provides an estimate of the doselevels of Compound A that do not exceed the MTD and incorporates all DLTinformation at all dose levels for this estimation. In general, the nextrecommended dose will have the highest chance that the DLT rate willfall in the target interval (16%-33%) and will always satisfy the EWOCprinciple. In all cases, the recommended dose for the next cohort willnot exceed a 100% increase from the previous dose. Smaller increases indose may be recommended by the SRC upon consideration of all of theavailable clinical data.

The procedure for subject accrual in each dose cohort and provisions fordose escalation/de-escalation decisions for the study is as follows: (1)In order to limit the number of subjects being treated at asub-therapeutic dose, this study will begin by evaluating Compound A incohorts of at least 3 evaluable subject at each dose level. Initially,the dosing increments between cohorts will be 100%. When 2 subjects (whomay be in different cohorts) have experienced a treatment-relatedtoxicity of NCI CTCAE Grade 2 or a single subject experiences a DLT orgrade ≥3 toxicity, the cohort size may be increased to at least 6evaluable subjects for the current and subsequent cohorts. The increasein Compound A dose will be ≤50% for each subsequent dose escalationcohort; (2) Following completion of Cycle 1 for all evaluable subjectsin a cohort, the two-parameter BLRM with EWOC principle will be used tomake recommendations to the SRC for the next dose level with thefollowing exceptions: If the first 2 subjects in a cohort experienceDLTs, no additional subjects will be enrolled into that cohort until theBayesian model has been updated with this new information. Likewise, themodel will be re-evaluated if 2 subjects in a cohort experience DLTsbefore the enrollment of any additional subject; If a decision has beenmade to escalate to a higher dose level, but one or more additionalsubjects treated at preceding dose levels (see number 4 below)experiences a DLT in Cycle 1, then the BLRM will be updated before anyadditional subject is enrolled to the current (higher) dose level; and(3) After each cohort, the SRC will meet and review data from the BLRMassessment and available safety (i.e., DLT and non-DLT data), PK, PD,and efficacy information. The final dose escalation decisions will bemade by the SRC.

After repeating the above steps, a Compound A dose can be declared theMTD and/or RP2D after meeting the following conditions: at least sixevaluable subjects have been treated at the dose; the posteriorprobability of targeted toxicity at the dose exceeds 60% and is thehighest among the escalation doses or a minimum of 21 subjects have beentreated on the study; and the dose is recommended according to the BLRMand the SRC approves it.

At the discretion of the SRC to better understand the safety,tolerability and PK of Compound A, additional cohorts of subjects may beenrolled at prior dose levels or to intermediate dose levels before orwhile proceeding with further dose escalation.

Provisional dose levels to be assigned to separate cohorts of subjectsare described herein. Dose decisions during escalation are however notlimited to these doses. Based on the recommendation of the BLRMregarding the highest dose that may not be exceeded at any decisionpoint during escalation and the maximum increase in dose allowed by theprotocol, intermediate doses may be administered to subsequent newcohorts of subjects. The decision to evaluate additional subjects withina dose cohort, a higher dose cohort, intermediate dose cohorts, smallerdose increments, alternate dosing schedules, or declare an MTD will alsobe determined by the SRC, based on their review of clinical andlaboratory safety data.

All subjects who receive at least one dose of Compound A will beevaluable for safety. After the first dose is administered in any cohortduring dose escalation, subjects in each cohort are observed for 28 days(Cycle 1, DLT window) before the next dose cohort can begin. No morethan one subject per day will be enrolled in a given dose escalationcohort. A subject evaluable for DLT is defined as one that: Has receivedat least 10 of 12 doses (or ≥80% of the total planned dose intensity) ofCompound A during Cycle 1 without experiencing a DLT; or Experienced aDLT after receiving at least one dose of Compound A.

Subjects non-evaluable for DLT are replaced. Additional subjects withinany dose cohort may be enrolled at the discretion of the SRC.Intra-subject dose escalation will not be allowed during the DLTassessment period. The MTD is defined as the highest dose that resultsin ≤33% of the subjects experiencing DLTs during their first cycle oftreatment. The estimation of MTD is described herein. A variable dosecohort (e.g., less frequent dosing) may be evaluated to accuratelydetermine the MTD at the discretion of the SRC.

During dose escalation, the DLT assessment period is Cycle 1 (28 days).National Cancer Institute (NCI) Common Terminology Criteria for AdverseEvents (CTCAE), Version 4.03 are used as a guide for the grading ofseverity of adverse events. A DLT is defined as any of the followingtoxicities occurring within the DLT assessment unless the event canclearly be determined to be unrelated to Compound A. Dose-limitingtoxicities are: (1) Any Grade 4 nonhematologic toxicity of any duration;(2) Any non-hematologic toxicity Grade ≥3 EXCEPT for: (a) Grade 3diarrhea, nausea, or vomiting of ≤3 days duration (with optimal medicalmanagement). (b) Grade 3 rash of the acneiform, pustular ormaculopapular type which resolves to Grade ≤2 within 7 days of studydrug interruption and does not recur at the same level with resumptionof study drug at the same dose (with optimal medical management). (c)Grade 3 fatigue which resolves to Grade ≤2 within 7 days of study druginterruption and does not recur at the same level with resumption ofstudy drug at the same dose (with optimal medical management); (3)Hematological toxicities as follows: Febrile neutropenia; Grade 4neutropenia lasting >7 days; Grade 4 thrombocytopenia lasting >7 days,Grade ≥3 thrombocytopenia with clinically significant bleeding; (4) AnyAE, unless clearly determined to be unrelated to the drug, necessitatingdose-level reduction during Cycle 1; and (5) Possibly a sustained grade3 hyperglycemia (×2 at least 24 hr apart) or symptomatic fasting grade 3or higher hyperglycemia.

Isolated laboratory changes without associated clinical signs orsymptoms (e.g., hypomagnesemia, hypermagnesemia, hypoalbuminemia,hypophosphatemia, lymphocyte count increased or decreased) may not beincluded in this definition. These findings are discussed and reviewedby the SRC.

Criteria for dose escalation in the next cohort of subjects are assessedas follows. Cohorts consist of at least three evaluable subjects. TheSRC makes all final dose escalation decisions. The decision criteria fordose escalation are: (1) If no more than 0 of three or 1 of 6 evaluablesubjects experience DLT within the DLT window in a dose cohort, doseescalation to the next higher dose cohort may occur. Additional subjectsare enrolled to expand the cohort to 6 evaluable subjects if less than 6subjects are evaluable when the DLT is observed; (2) If two or more ofup to 6 evaluable subjects experience a DLT within the DLT window in adose cohort, any further recruitment ceases and this dose is defined asthe NTD; and (3) SRC determines if additional subjects are enrolled atlower dose cohorts to have 6 evaluable subjects in order to define MTD,or whether an intermediate dose cohort or alternative schedule isexplored in up to 6 newly enrolled subjects.

The number of cohorts depends on incidence of DLT. A subject mayexperience more than one DLT. Dose escalation decisions are based on thenumber of subjects experiencing DLT events.

During Part A, the dose escalation stopping rules are described herein.Dose reductions are permitted in any cycle, including Cycle 1. Dosereductions that occur in Cycle 1 during dose escalation will constituteDLT as outlined, but subjects are allowed to continue on Compound A at areduced dose. When a dose reduction is indicated, the next lower dosecohort will be selected or a less frequent dosing schedule. Two dosereductions are allowed. Once the dose has been reduced, it can beescalated when toxicity reaches Grade ≤1. If toxicity recurs at thehigher dose, the dose is reduced a second time, but no re-escalation isthen permitted. If any subject continues to experience unacceptabletoxicity after two dose reductions (one for the starting dose), CompoundA is discontinued permanently. Intra-subject dose escalation is not beallowed during the DLT assessment period.

Further regarding dose reduction, any AE meeting the definition of DLTrequires dose interruption. Doses should be delayed if any Grade ≥2toxicities are not resolved to Grade ≤1 by the time of the next dose.Grade ≥3 toxicity or chronic Grade 2 toxicity may warrant dose reductionof Compound A. Such cases should be discussed with the Sponsor (medicalmonitor and study physician) before dosing changes are made.

Further regarding criteria for dose increase, in Part A (escalationphase), intrasubject dose escalation beyond the doses initially assignedto a subject is not permitted in Cycle 1. Those continuing to takeCompound A beyond Cycle 2 may, following approval by the SRC, have thedose increased providing the alternative dose has been shown to be welltolerated by at least one cohort of subjects in this study (i.e.,overdose risk is less than 25% based on the BLRM assessment). In theevent of intra-subject dose escalation and with (optional) subjectconsent, blood is withdrawn for PK assessments following the Cycle 1 Day1 PK schedule for Part A. PK sampling occurs after at least 2 doses ofCompound A at the higher dose in order to evaluate intra-subjectCompound A PK. In Part B (expansion phase), no dose escalation beyondthe MTD is allowed.

Treatment may be interrupted up to four weeks until toxicity (excludingalopecia) reaches either Grade ≤1 or baseline levels. Treatment mayrestart either at the same, or a reduced dose, at the Investigator'sdiscretion or as described herein. Any such treatment interruptions mustbe discussed with the Sponsor medical monitor.

In the DLT assessment period of the dose escalation phase, a treatmentinterruption with ≥2 missed doses of Compound A for reasons other thanDLT will make a subject non-evaluable for DLT and necessitatereplacement of that subject in the dosing cohort. Any such treatmentinterruptions must be discussed with the sponsor study monitor.

Regarding management of select adverse events such as Neutropenia,Thrombocytopenia, and Anemia, hematopoietic growth factors or otherhematologic support, such as erythropoietin, darbepoetin,granulocyte-colony stimulating factor (G-CSF), granulocyte-macrophagecolony stimulating factor (GM-CSF), RBC- or platelet-transfusions areallowed in the study with therapeutic intent. Therapeutic use of G-CSFis allowed at any time for subjects experiencing Grade 3/4 neutropeniaor any grade febrile neutropenia. Prophylactic use of granulocyte (orgranulocyte-macrophage) growth factors is not allowed during Cycle 1.Subjects with Grade 3 or 4 neutropenia should be monitored frequentlywith laboratory tests until resolution to Grade ≤1. Antimicrobial,antifungal, and antiviral prophylaxis should be considered. For pain,tumor pain or treatment-induced pain can be controlled with opioid andopioid-related analgesics, such as codeine, meperidine, propoxyphene ormorphine, administered at the clinician's discretion, and as dictated bymedical need. The risk of bleeding, especially in the setting ofthrombocytopenia, should be considered prior to use of non-steroidalanti-inflammatory drugs (NSAIDs) and aspirin.

For Gastrointestinal Effects, mucosa coating agents for protection ofesophageal/gastric mucosa are recommended at the discretion of theInvestigator as well as monitoring subjects for GI bleeding. Subjectsare encouraged to report all episodes of GI discomfort or pain, appetiteloss, or blood in stool. It is recommended that subjects experiencingdiarrhea be managed according to the guideline provided in FIG. 7.Antidiarrheal medication, such as loperamide, should be initiated at theearliest onset of Grade 1-2 diarrhea. Antidiarrheal medication may beadministered as prophylaxis and for treatment of diarrhea. Dehydrationand electrolyte disturbances should be rapidly corrected. Generalmeasures to improve diarrhea, such as a low-fiber diet and increaseliquid assumption, should be considered.

Changes in blood glucose were not observed in the nonclinical toxicologystudies with Compound A. Preliminary clinical data of a newinvestigational BETi, OTX015, however, reported seven of thirty-sevenpatients with non-leukemic hematologic malignancies experienced Grade1-2 hyperglycemia and 1 patient experienced Grade 3 hyperglycemia.Thieblemont, 2014. It is unknown whether hyperglycemia might be observedwith Compound A and general guidelines for the management of possiblehyperglycemia are provided in Appendix E.

Overdose, as defined for this protocol, refers to Compound A dosingonly. On a per dose basis, an overdose is defined as the followingamount over the protocol-specified dose of Compound A assigned to agiven subject, regardless of any associated adverse events or sequelae:PO any amount over the protocol-specified dose.

On a schedule or frequency basis, an overdose is defined as anythingmore frequent than the protocol required schedule or frequency. Completedata about drug administration, including any overdose, regardless ofwhether the overdose was accidental or intentional, should be reportedin the case report form.

Regarding method of treatment assignment, eligible subjects will beenrolled sequentially in Part A (dose escalation). Enrollment in Part B(dose expansion) will be stratified by disease cohort and dosingschedule, as applicable. An Interactive Response Technology (IRT) systemwill be used to track subject assignments to the dose levels in Part Aand tumor cohorts in Part B.

The label(s) for Compound A includes the sponsor name, address andtelephone number, the protocol number, Compound A, dosage form andstrength (where applicable), amount of Compound A per container, lotnumber, expiry date (where applicable), medication identification/kitnumber, dosing instructions, storage conditions, and required cautionstatements and/or regulatory statements as applicable. Additionalinformation may be included on the label as applicable per localregulations.

The investigator and relevant site personnel are trained on proceduresfor documenting receipt of Compound A, as well as the procedures forcounting, reconciling Compound A, disposing of Compound A, anddocumenting these processes, as is review with the Investigator andrelevant site personnel the process for Compound A return, disposal, ordestruction including responsibilities for the site or appropriatedesignee.

Only the pharmacist or the Investigator's designee dispenses theCompound A formulation. A record of the number of capsules/tablets ofCompound A dispensed to and taken by each subject must be maintained.The pharmacist or the Investigator's designee will document the dosesdispensed/administered in the appropriate study records. Subjects usediary cards to record their daily self-administration of Compound A athome. The person completing the diary card signs/initials and dates thecards in accordance with good documentation practice. These are reviewedby study staff each time the subject visits the clinic. Entries areclarified, as necessary, so that appropriate information can be capturedon the eCRFs. Study site personnel perform a Compound A administrationcompliance check and record this information on the subject's sourcedocumentation and on the appropriate eCRF.

All medications (excluding prior cancer therapy for the tumor underevaluation) taken beginning when the subject signs the ICD and allconcomitant therapy during the study until 28 days after treatmentdiscontinuation, together with dose, dose frequency and reasons fortherapy use will be documented in the source documents and on theconcomitant medication eCRF. All prior cancer therapy for the tumorunder evaluation, including chemotherapy, biologic, immunologic,irradiation, and surgery, will be documented on dedicated prior cancertreatment eCRFs. The Investigator instructs subjects to notify the studystaff about any new medications taken after signing the ICD. Allmedications and significant non-drug therapies (herbal medicines,physical therapy, etc.) and any changes in dosing with existingmedications will be documented on the eCRFs. Subject to precautions, theuse of any concomitant medication/therapies deemed necessary for thecare of the subject should be used. Repeat PK evaluations may beconducted if changes are made to concomitant medications suspected ofaffecting drug absorption or metabolism.

The following are permitted concomitant medications and procedures: (1)Subjects with ≥Grade 1 diarrhea should promptly initiate treatment withdiphenyoxylate/atropine (Lomotil), or loperamide (Imodium) or analternative over-the-counter remedy for diarrhea. Premedication withantidiarrheal medication for subsequent doses of Compound A may beappropriate and should be discussed with medical monitor; (2)Anti-emetics will be withheld until subjects have experiencedCTCAE≥Grade 1 nausea or vomiting. Subjects may then receive prophylacticanti-emetics at the discretion of the investigator; (3) Subjects mayreceive prophylactic mucosa protective agents at the discretion of theinvestigator; (4) Therapeutic use of granulocyte growth factors isallowed at any time for subjects experiencing febrile neutropenia orGrade 3/4 neutropenia. Routine prophylaxis with granulocyte colonystimulating factor or granulocyte-macrophage colony stimulating factoris allowed at Investigator discretion starting with Cycle 2 and beyond;(5) Subjects receiving stable doses of recombinant erythropoietin ordarbepoetin alfa for at least 4 weeks prior to starting the Compound Amay continue their pretreatment doses throughout the study. Subjects mayinitiate de novo treatment with erythropoietin stimulating agents (ESAs)beginning in Cycle 2 for hypoproliferative anemias secondary to priorchemotherapy exposure provided there is no clinical suspicion of aconcurrent cause for the anemia (e.g., Compound A-induced); (6)Parenteral flu vaccination is permitted; (7) Routine infectious diseaseprophylaxis is not required. Antibiotic, antiviral, antipneumocystis,antifungal, or other prophylaxis may be implemented during the study atthe discretion of the Investigator; (8) Treatment with bisphosphonates(e.g., pamidronate, zolendronate) or other agents (e.g., denosumab) ispermitted to prevent or delay progression of bone metastases.Maintenance of a stable dosing regimen throughout the study isrecommended; (9) Focal palliative radiotherapy for treatment ofcancer-related symptoms (e.g., localized bone pain) is allowed duringstudy treatment at the discretion of the investigator; (10) Subjects mayreceive physiologic replacement doses of glucocorticoids (up to theequivalent of 10 mg daily prednisone) as maintenance therapy for adrenalinsufficiency; and (11) Maintenance hormonal therapies are allowed insubjects with a history of breast or prostate cancer.

Other investigational therapies must not be used while the subject is onthe study. Anticancer therapy (chemotherapy, biologic or investigationaltherapy, and surgery) other than the study treatments must not be givento subjects while the subject is on the study. If such treatment isrequired, the subject must be discontinued from the study. Treatmentwith chronic, therapeutic dosing of anti-coagulants (e.g., warfarin, lowmolecular weight heparin, Factor Xa inhibitors) is not allowed.Short-term, prophylactic dosing of anticoagulants may be considered insubjects if medically indicated (e.g., hospitalized subjects,post-operatively).

Regarding statistical considerations, the primary objectives of thisstudy are to determine the safety, tolerability, and MTD of Compound Awhen administered orally on a 3/7-day schedule to adult subjects withadvanced solid tumors and relapsed/refractory NHL, and to determine itsPK characteristics. The secondary objective is to make a preliminaryassessment of the antitumor activity of Compound A. Datasummaries/statistical analyses are performed by study part (Part A orB), dose level (Part A), and tumor cohort (Part B) as applicable. StudyPopulation Definitions are as follows: (1) Enrolled Population—Allsubjects who are assigned an enrollment number and meetinclusion/exclusion criteria; (2) Treated.

Population—All subjects who enroll and receive at least one dose ofCompound A; (3) Efficacy Evaluable (EE) Population—All subjects whoenroll in the study, meet eligibility criteria, complete at least onecycle of Compound A (taking at least 80% of assigned doses), and havebaseline and at least one valid post-baseline tumor assessment; (4)Pharmacokinetic (PK) Evaluable Population—all subjects who enroll andreceive at least one dose of Compound A and have at least one measurableconcentration of Compound A; and (5) Biomarker Evaluable (BE)Population—all subjects who enroll, receive at least one dose of studydrug, and have at least one biomarker assessment, excluding disqualifiedassessments;

During Part A of the study, an adaptive Bayesian logistic regression(BLR) model (with 2 parameters) guided by the escalation with overdosecontrol (EWOC) principle. No formal statistical power calculations todetermine sample size were performed for this study. The actual numberof subjects will depend on the number of dose levels/cohorts that aretested. The anticipated number of subjects is approximately forty. Afterthe MTD or RPTD is determined from Part A, Part B will enrollapproximately 14 to up to 20 additional subjects per pre-specified tumortypes.

For Part B, sample sizes are not determined based on power calculationbut rather on clinical, empirical and practical considerationstraditionally used for exploratory studies of this kind. Enrollment in atumor-specific cohort will be stopped for futility if there are noobjective responses or fewer than 3 subjects with stable disease lastingat least 4 mo (i.e., two or more post-baseline, tumor assessment timepoints) from among the first 14 subjects within a tumor type. If atleast one objective response or 3 subjects with stable disease lasting≥4 mo is observed from among the first 14 efficacy-evaluable subjectsenrolled, up to 6 more subjects will enroll for a total of 20 evaluablesubjects in the cohort. If the response rate is 20%, the probability ofseeing no response in the first 14 subjects will be 4.4%. If the rate ofstable disease lasting for at least 4 mo is 40%, the probability ofseeing fewer than three subjects with stable disease lasting for atleast 4 mo will be 4%. If there are more SDs then objective responses,disease control rate rather than ORR may be assessed.

In Part A, the baseline characteristics of subjects will be summarizedby dose cohort for the enrolled population. In Part B, the baselinecharacteristics of subjects is summarized by tumor type. The age,weight, height and other continuous demographic and baseline variableswill be summarized using descriptive statistics. Performance status,gender, race and other categorical variables will be summarized withfrequency tabulations. Medical history data is summarized usingfrequency tabulations by system organ class and preferred term.

Subject disposition (analysis population allocation, on-going,discontinued, along with primary reason) from treatment and study issummarized using frequency and percent. A summary of subjects enrolledby site is provided. Protocol violations are summarized using frequencytabulations. Supportive corresponding subject listings are alsoprovided.

Efficacy analyses are based on the treated population and includesummaries of disease control rate (DCR), objective response rate (ORR),duration of response or stable disease, progression-free survival (PFS),and OS by dose cohort and dosing schedule (Part A) or tumor type anddosing schedule (Part B). Tumor response (CR, PR, SD, PD, orinevaluable) is assessed by investigators according to ResponseEvaluation Criteria in Solid Tumors (RECIST), version 1.1 and IWGcriteria. The DCR is defined as the percent of subjects whose bestresponse is CR, PR or SD. The ORR is defined as the percent of subjectswhose best response is CR or PR. When SD is the best response, it mustbe documented radiographically at least once after study entry after aminimal interval of 7 weeks (i.e., coincident with the first postbaseline response assessment time point minus assessment window). If theminimal time for a best response of SD is not met, the subject's bestresponse will depend on the outcome of subsequent assessments. Forexample, a subject who exhibits SD at first assessment (where the firstassessment does not meet minimal duration criteria for SD) and PD at thesecond assessment, would be classified as having a best response of PD.A subject lost to follow-up after the first SD assessment would beconsidered non-evaluable, if the minimal duration criteria for SD arenot met.

Two-sided 95% Clopper-Pearson exact confidence intervals are providedfor ORR and DCR estimates. Similar analyses will be performed to includethose subjects with confirmed responses as well as for the EfficacyEvaluable population. For subjects with best response of CR or PR,duration of response is measured from the time when criteria for CR/PRare first met (whichever is first recorded) until the first date atwhich progressive disease is objectively documented. For subjects withbest response of SD, duration of SD is measured from the first dose dateuntil the criteria for progression are met. If progression is notdocumented prior to Compound A discontinuation, duration of overallresponse, and duration of SD will be censored at the date of the lastadequate tumor assessment.

Duration of response/SD based on investigators' assessments will besummarized by descriptive statistics (mean, standard deviation, median,minimum and maximum) for the treated population. Except for medians,which will be calculated based on both observed and censored valuesusing the Kaplan-Meier method, all other statistics (mean, standarddeviation, minimum and maximum) are calculated based on observed valuesonly.

Progression-Free Survival (PFS) is defined as the time from the firstdose of Compound A to the first occurrence of disease progression ordeath from any cause. Subjects who neither progress nor die at a datacut-off date are censored at the date of their last adequate tumorassessment. The PFS is summarized using descriptive statistics (mean,standard deviation, median, minimum and maximum) for the treatedpopulation. Except for the median, which is calculated based on bothobserved and censored values using the Kaplan-Meier method, all otherstatistics (mean, standard deviation, minimum and maximum) is calculatedbased on observed values only.

Overall Survival (OS) is measured as the time from the first dose ofCompound A to death due to any cause and is analyzed in a manner similarto that described for PFS.

Adverse events, including treatment-emergent adverse events (TEAEs),laboratory assessments, vital signs, ECG results, ECOG performancestatus, LVEF assessments, physical examinations, vital signs, exposureto study treatment, assessment of concomitant medications, and pregnancytesting for females of childbearing potential are summarized for thetreated population (by dose cohort in Part A and tumor type in Part B).

Adverse events observed are classified using the Medical Dictionary forRegulatory Activities (MedDRA), Version 17.1 or higher, system organclass (SOC) and preferred term (PT). In the by-subject analysis, asubject having the same AE more than once is counted only once. Alladverse events are summarized by SOC, PT, and NCI CTCAE grade (Version4.0 or higher). Adverse events leading to discontinuation of studytreatment, those classified as Grade 3 or 4, study drug-related AEs, andSAEs (including deaths) are tabulated separately. By-subject listings ofall AEs, TEAEs, SAEs (including deaths), and their attribution areprovided.

Clinical laboratory results are summarized descriptively by dose cohort(Part A) or tumor type (Part B) and visit, which also includes a displayof change from baseline. Shift tables demonstrating the changes(low/normal/high) from baseline to worst post-baseline laboratory valueare displayed in cross-tabulations by dose cohort (Part A) or tumor type(Part B). Similar shift tables demonstrating the change of NCI CTCAEgrades from baseline to the worst post-baseline severity grade duringthe treatment period are presented by dose cohort (Part A) or tumor type(Part B) for applicable analytes. Listings of abnormal clinicallaboratory data according to NCI CTCAE severity grades (if applicable),abnormal flags (low or high) and clinical significance of the latter areprovided.

Graphical displays (e.g., “spaghetti” plots or box plots) are providedfor key laboratory analytes. Descriptive statistics for vital signs,both observed values and changes from baseline, are summarized by dosecohort (Part A) or tumor type (Part B) and visit. Shift tablesdemonstrating the changes from baseline to the worst post-baseline valueis displayed in cross-tabulations by dose cohort (Part A) or tumor type(Part B). Vital sign measurements are listed by subject and by visit.ECG parameters and changes from baseline is summarized by dose cohort(Part A) or tumor type (Part B) and visit using descriptive statistics.Post-baseline abnormal QTc (both QTcF and QTcB) values are summarizedusing frequency tabulations for the following five categories: (1)QTc>450 msec; (2) QTc>4 80 msec; (3) QTc>500 msec; (4) QTc increase frombaseline >30 msec; (5) QTc increase from baseline >60 msec.

Shift from baseline to worst post-baseline qualitative assessment ofabnormality (i.e., ‘Normal’, ‘Abnormal, not clinically significant’, and‘Abnormal, clinically significant’ or ‘Normal’ and ‘Abnormal’) aredisplayed in cross-tabulations by dose cohort (Part A) or tumor type(Part B). A listing of ECG parameters by subject, by visit will beprovided.

No formal interim analysis is planned. Data is reviewed on an ongoingbasis.

Regarding statistical method for dose escalation, an adaptive BLRMguided by the escalation with EWOC principle will be used to make doserecommendations and estimate the MTD during the escalation phase of thestudy (refer to Appendix H). The DLT relationship in the escalation partof the study will be described by the following Bayesian logisticregression model:

${{\log\left( \frac{p_{j}}{1 - p_{j}} \right)} = {{\log\mspace{14mu}\alpha} + {\beta \cdot {\log\left( \frac{d_{j}}{d^{*}} \right)}}}},{\alpha > 0},{\beta > 0}$in which each p_(j) is the DLT rate at each dose; each d_(j); is doselevels; d*=90 mg is reference dose; α is odds of DLT at d*. Regardingprior specifications, prior for (log(α), log(β)): A vague bivariatenormal prior for the model parameters (log(α), log(β)) is elicited basedon prior guesses (medians) from preclinical data and wide confidenceintervals for the probabilities of a DLT at each dose. Prior MTD isassumed to be 180 mg based on preclinical data. The probability of DLTfor the first dose is assumed to be low. The parameters of the priordistributions of model parameters are selected based on the method toconstruct weakly informative prior as described in Neuenschwander et al.(2015), and are provided in Table 6. FIG. 5 illustrates the resultingprior distribution of DLT rate derived from the prior given in Table 6:

TABLE 6 Prior Parameters for Bivariate Normal Distribution of ModelParameters Parameters Means Standard Deviation Correlation log(α),log(β) (−0.693, 0.3936) (2.1) 0

The provisional dose levels are: 15 mg, 30 mg, 60 mg, 90 mg, 120 mg,150mg, 180 mg, and 200 mg. It is possible for some doses to be skipped oradditional dose levels to be added during the course of the study, basedon emerging safety information. After each cohort of subjects theposterior distributions for the probabilities of a DLT rates atdifferent dose levels are obtained. The results of this analysis aresummarized in terms of the estimated probabilities that the true rate ofDLT at each dose-level will have of lying in each of the followingintervals: [0, 0.16] under-dosing; [0.16, 0.33] targeted toxicity;[0.33, 1.00] excessive toxicity.

Following the principle of escalation with EWOC, after each cohort ofsubjects the recommended dose is the one with the highest posteriorprobability of the DLT rate falling in the target interval (16%, 33%)among the doses fulfilling EWOC, i.e., it is unlikely (<25% posteriorprobability) that the DLT rate at the dose falls in the excessivetoxicity interval.

Note that the dose that maximizes the posterior probability of targetedtoxicity is the best estimate of the MTD, but it may not be anadmissible dose according to the overdose criterion if the amount ofdata is insufficient. If vague prior information is used for theprobabilities of DLT, in the early stages of the study this escalationprocedure will reflect a conservative strategy.

The dose recommended by the adaptive Bayesian logistic model may beregarded as guidance and information to be integrated with a clinicalassessment of the toxicity profiles observed at the time of the analysisin determining the next dose level to be investigated.

Regarding the assessment of pharmacokinetics, plasma PK parameters suchas AUC_(24h), C_(max), T_(max), t_(1/2), CL/F, and V_(z)/F of Compound Aare calculated by the noncompartmental analysis method from the plasmaconcentration-time profiles of Compound A. Additional PK parameters maybe calculated, if data permits. Summary statistics including number ofsubjects (N), mean, standard deviation (SD), coefficient of variation(CV %), geometric mean, geometric CV %, median, minimum, and maximum areprovided for Compound A concentration by nominal time point, study day,and dose cohort. Mean and individual plots of plasma concentrations arepresented in both original and semi-logarithmic scales. Summarystatistics are provided for Compound A PK parameters by study day anddose cohort and be presented in tabular form. The relationship betweenCompound A dose, plasma exposures, and selected clinical endpoints(e.g., measures of toxicities, effectiveness, and/or biomarkers) may beexplored.

For assessment of pharmacodynamics, descriptive statistics (N, mean, SD,median, min, and max) will be provided for baseline, post-baselinevalues, and changes from baseline or percent change from baseline ofeach biomarker by dose cohort (Part A) or tumor type (Part B) and visit.Subjects' biomarker results over time will be plotted. Comparison ofbiomarker levels before and during treatment will be performed byWilcoxon signed rank test. If sufficient and valid results frombiomarker assays can be obtained, the relationship between percentchanges in biomarker levels and clinical endpoints including ORR and DCRare explored.

Further regarding adverse events, in particular the monitoring,recording and reporting of adverse events, an AE is any noxious,unintended, or untoward medical occurrence that may appear or worsen ina subject during the course of a study. It may be a new intercurrentillness, a worsening concomitant illness, an injury, or any concomitantimpairment of the subject's health, including laboratory test values,regardless of etiology. Any worsening (i.e., any clinically significantadverse change in the frequency or intensity of a pre-existingcondition) should be considered an AE. A diagnosis or syndrome should berecorded on the AE page of the CRF rather than the individual signs orsymptoms of the diagnosis or syndrome. Abuse, withdrawal, sensitivity ortoxicity to an investigational product (IP) should be reported as an AE.Overdose, accidental or intentional, whether or not it is associatedwith an AE should be reported on the overdose CRF. Any sequela of anaccidental or intentional overdose of an investigational product shouldbe reported as an AE on the AE CRF. If the sequela of an overdose is anSAE, then the sequela must be reported on an SAE report form and on theAE CRF. The overdose resulting in the SAE should be identified as thecause of the event on the SAE report form and CRF but should not bereported as an SAE itself.

In the event of overdose, the subject should be monitored as appropriateand should receive supportive measures as necessary. There is no knownspecific antidote for Compound A overdose. Actual treatment shoulddepend on the severity of the clinical situation and the judgment andexperience of the treating physician.

All subjects will be monitored for AEs during the study. Assessments mayinclude monitoring of any or all of the following parameters: thesubject's clinical symptoms, laboratory, pathological, radiological orsurgical findings, physical examination findings, or findings from othertests and/or procedures.

All AEs are recorded by the Investigator from the time the subject signsinformed consent until 28 days after the last dose of Compound A as wellas those SAEs made known to the Investigator at any time thereafter thatare suspected of being related to Compound A. AEs and SAEs are recordedon the AE page of the CRF and in the subject's source documents. AllSAEs must be reported to Drug Safety within 24 hours of theInvestigator's knowledge of the event by facsimile, or other appropriatemethod, using the SAE Report Form, or approved equivalent form.

A qualified Investigator evaluates all adverse events as to Seriousness.A SAE is any AE occurring at any dose that: Results in death; Islife-threatening (i.e., in the opinion of the Investigator, the subjectis at immediate risk of death from the AE); Requires inpatienthospitalization or prolongation of existing hospitalization(hospitalization is defined as an inpatient admission, regardless oflength of stay); Results in persistent or significantdisability/incapacity (a substantial disruption of the subject's abilityto conduct normal life functions); Is a congenital anomaly/birth defect;or Constitutes an important medical event.

Important medical events are defined as those occurrences that may notbe immediately life-threatening or result in death, hospitalization, ordisability, but may jeopardize the subject or require medical orsurgical intervention to prevent one of the other outcomes listed above.Medical and scientific judgment should be exercised in deciding whethersuch an AE should be considered serious.

Events not considered to be SAEs are hospitalizations for: a standardprocedure for protocol therapy administration. Hospitalization orprolonged hospitalization for a complication of therapy administrationis reported as an SAE; routine treatment or monitoring of the studiedindication not associated with any deterioration in condition; theadministration of blood or platelet transfusion as routine treatment ofstudied indication (hospitalization or prolonged hospitalization for acomplication of such transfusion remains a reportable SAE); a procedurefor protocol/disease-related investigations (e.g., surgery, scans,endoscopy, sampling for laboratory tests, bone marrow sampling)(hospitalization or prolonged hospitalization for a complication of suchprocedures remains a reportable SAE); hospitalization or prolongation ofhospitalization for technical, practical, or social reasons, in absenceof an AE; a procedure that is planned (i.e., planned prior to start oftreatment on study) must be documented in the source document and theCRF (hospitalization or prolonged hospitalization for a complicationremains a reportable SAE); an elective treatment of or an electiveprocedure for a pre-existing condition, unrelated to the studiedindication, that has not worsened from baseline; or emergency outpatienttreatment or observation that does not result in admission, unlessfulfilling other seriousness criteria described above.

If an AE is considered serious, both the AE page/screen of the CRF andthe SAE Report Form must be completed. For each SAE, the Investigatorwill provide information on severity, start and stop dates, relationshipto the IP, action taken regarding the IP, and outcome.

For both AEs and SAEs, the Investigator must assess theseverity/intensity of the event. The severity/intensity of AEs will begraded based upon the subject's symptoms according to the current activeminor version of the Common Terminology Criteria for Adverse Events(CTCAE, Version 4.03), available at the CTEP cancer website, underprotocol Development.

AEs that are not defined in the CTCAE should be evaluated forseverity/intensity according to the following scale: Grade1=Mild—transient or mild discomfort; no limitation in activity; nomedical intervention/therapy required; Grade 2=Moderate—mild to moderatelimitation in activity, some assistance may be needed; no or minimalmedical intervention/therapy required; Grade 3=Severe—marked limitationin activity, some assistance usually required; medicalintervention/therapy required, hospitalization is possible; Grade4=Life-threatening-extreme limitation in activity, significantassistance required; significant medical intervention/therapy required,hospitalization or hospice care probable; and Grade 5=Death—the eventresults in death.

The term “severe” is often used to describe the intensity of a specificevent (as in mild, moderate or severe myocardial infarction); the eventitself, however, may be of relatively minor medical significance (suchas severe headache). This criterion is not the same as “serious” whichis based on subject/event outcome or action criteria associated withevents that pose a threat to a subject's life or functioning.Seriousness, not severity, serves as a guide for defining regulatoryobligations.

Causality is assessed. The Investigator must determine the relationshipbetween the administration of the Compound A and the occurrence of anAE/SAE as Not Suspected or Suspected as defined below:

-   -   Not suspected: a causal relationship of the adverse event to        Compound A administration is unlikely or remote, or other        medications, therapeutic interventions, or underlying conditions        provide a sufficient explanation for the observed event.    -   Suspected: there is a reasonable possibility that the        administration of Compound A caused the adverse event.        ‘Reasonable possibility’ means there is evidence to suggest a        causal relationship between the IP and the adverse event.

Causality should be assessed and provided for every AE/SAE based oncurrently available information. Causality is to be reassessed andprovided as additional information becomes available. If an event isassessed as suspected of being related to a comparator, ancillary oradditional Compound A that has not been manufactured or provided by theSponsor, please provide the name of the manufacturer when reporting theevent.

Regarding duration, for both AEs and SAEs, the Investigator provides arecord of the start and stop dates of the event. The Investigatorreports the action taken with IP as a result of an AE or SAE, asapplicable (e.g., discontinuation, interruption, or dose reduction ofIP, as appropriate) and report if concomitant and/or additionaltreatments were given for the event. The Investigator reports theoutcome of the event for both AEs and SAEs. All SAEs that have notresolved upon discontinuation of the subject's participation in thestudy must be followed until recovered (returned to baseline), recoveredwith sequelae, or death (due to the SAE).

Regarding Abnormal Laboratory Values, an abnormal laboratory value isconsidered to be an AE if the abnormality: (a) results indiscontinuation from the study; (b) requires treatment,modification/interruption of Compound A dose, or any other therapeuticintervention; or (c) is judged to be of significant clinical importance,e.g., one that indicates a new disease process and/or organ toxicity, oris an exacerbation or worsening of an existing condition.

Regardless of severity grade, only laboratory abnormalities that fulfilla seriousness criterion need to be documented as a serious adverseevent. If a laboratory abnormality is one component of a diagnosis orsyndrome, then only the diagnosis or syndrome should be recorded on theAE page/screen of the CRF. If the abnormality was not a part of adiagnosis or syndrome, then the laboratory abnormality should berecorded as the AE. If possible, the laboratory abnormality should berecorded as a medical term and not simply as an abnormal laboratoryresult (e.g., record thrombocytopenia rather than decreased platelets).

All pregnancies or suspected pregnancies occurring in either a femalesubject of childbearing potential or partner of childbearing potentialof a male subject are immediately reportable events. The exposure of anypregnant female (e.g., caregiver, pharmacist, study coordinator ormonitor) to Compound A is also an immediately reportable event.Pregnancies and suspected pregnancies (including elevated β-hCG orpositive pregnancy test in a female subject of childbearing potentialregardless of disease state) occurring while the subject is on CompoundA, or within three months (to be determined) of the subject's last doseof Compound A, are considered immediately reportable events.Investigational product is to be discontinued immediately. Thepregnancy, suspected pregnancy, or positive pregnancy test must bereported to Sponsor Drug Safety immediately by email, phone orfacsimile, or other appropriate method, using the Pregnancy InitialReport Form, or approved equivalent form.

The female subject should be referred to an obstetrician-gynecologist,preferably one experienced in reproductive toxicity for furtherevaluation and counseling. The Investigator follows the female subjectuntil completion of the pregnancy, and must notify Sponsor Drug Safetyimmediately about the outcome of the pregnancy (either normal orabnormal outcome) using the Pregnancy Follow-up Report Form, or approvedequivalent form. If the outcome of the pregnancy was abnormal (e.g.,spontaneous abortion), the Investigator will report the abnormal outcomeas an AE. If the abnormal outcome meets any of the serious criteria, itmust be reported as an SAE to Sponsor Drug Safety by facsimile, or otherappropriate method, within 24 hr of the Investigator's knowledge of theevent using the SAE Report Form, or approved equivalent form. Allneonatal deaths that occur within 28 days of birth are reported, withoutregard to causality, as SAEs. In addition, any infant death after 28days that the Investigator suspects is related to the in utero exposureto the Compound A should also be reported to Sponsor Drug Safety byfacsimile, or other appropriate method, within 24 hours of theInvestigator's knowledge of the event using the SAE Report Form, orapproved equivalent form.

For male subjects, if a female partner of a male subject taking CompoundA becomes pregnant, the male subject taking Compound A should notify theInvestigator, and the pregnant female partner should be advised to calltheir healthcare provider immediately. Where applicable, the Compound Amay need to be discontinued in the male subject, but may be resumedlater at the discretion of the Investigator and medical monitor.

Any AE that meets any criterion for an SAE requires the completion of anSAE Report Form in addition to being recorded on the AE page/screen ofthe CRF. All SAEs are reported to Sponsor Drug Safety within 24 hr ofthe Investigator's knowledge of the event by facsimile, or otherappropriate method (e.g., via email) using the SAE Report Form, orapproved equivalent form. This instruction pertains to initial SAEreports as well as any follow-up reports. The Investigator is requiredto ensure that the data on these forms is accurate and consistent. Thisrequirement applies to all SAEs (regardless of relationship to CompoundA) that occur during the study (from the time the subject signs informedconsent until 28 days after the last dose of Compound A) or any SAE madeknown to the Investigator at any time thereafter that are suspected ofbeing related to Compound A. Serious adverse events occurring prior totreatment (after signing the ICD) will be captured. The SAE reportshould provide a detailed description of the SAE and include a concisesummary of hospital records and other relevant documents. If a subjectdied and an autopsy has been performed, copies of the autopsy report anddeath certificate are to be sent to Sponsor Drug Safety as soon as thesebecome available. Any follow-up data should be detailed in a subsequentSAE Report Form, or approved equivalent form, and sent to Sponsor DrugSafety. Where required by local legislation, the Investigator isresponsible for informing the Institutional Review Board/EthicsCommittee (IRB/EC) of the SAE and providing them with all relevantinitial and follow-up information about the event. The Investigator mustkeep copies of all SAE information on file including correspondence withSponsor and the IRB/EC.

Queries pertaining to SAEs are communicated from Drug Safety to the sitevia facsimile or electronic mail. The response time is expected to be nomore than five (5) business days. Urgent queries (e.g., missingcausality assessment) may be handled by phone.

For the purpose of regulatory reporting, Drug Safety determines theexpectedness of events suspected of being related to Compound A based onan Investigator Brochure. In the United States, all suspected unexpectedserious adverse reactions (SUSARs) are reported in an expedited mannerin accordance with 21 CFR 312.32. For countries within the EuropeanEconomic Area (EEA), an authorized representative reports in anexpedited manner to Regulatory Authorities and Ethics Committeesconcerned, suspected unexpected serious adverse reactions (SUSARs) inaccordance with Directive 2001/20/EC and the Detailed Guidance oncollection, verification and presentation of adverse reaction reportsarising from clinical trials on investigational products for human use(ENTR/CT3) and also in accordance with country specific requirements.Adverse events such as disease progression, death related to diseaseprogression (in the absence of serious Compound A-related events) andserious events due to the relapse of the studied indication will not besubject to expedited reporting by the Sponsor to regulatory authorities.

An authorized representative shall notify the Investigator of thefollowing information: (1) Any AE suspected of being related to the useof Compound A in this study or in other studies that is both serious andunexpected (e.g., SUSAR); (2) Any finding from tests in laboratoryanimals that suggests a significant risk for human subjects includingreports of mutagenicity, teratogenicity, or carcinogenicity.

Where required by local legislation, the Investigator shall notifyhis/her IRB/EC promptly of these new serious and unexpected AE(s) orsignificant risks to subjects. The Investigator must keep copies of allpertinent safety information on file including correspondence with theCompound A drug product supplier, responsible party, and the IRB/EC.

The following events are considered sufficient reasons for discontinuinga subject from the study treatment: Adverse Event; Withdrawal bysubject; Lack of efficacy; Physician decision; Protocol violation;Progressive disease; Death; Lost to follow-up; Other (to be specified onthe CRF).

The reason for discontinuation of treatment should be recorded in theCRF and in the source documents. The decision to discontinue a subjectfrom treatment remains the responsibility of the treating physician,which will not be delayed or refused by the Sponsor. Prior todiscontinuing a subject, however, the Investigator may contact theMedical Monitor and forward appropriate supporting documents for reviewand discussion.

The following events are considered sufficient reasons for discontinuinga subject from the study: Screen failure; Adverse event; Withdrawal bysubject; Lack of efficacy; Physician decision; Protocol violation;Progressive disease; Death; Lost to follow-up; Other (to be specified onthe CRF). The reason for study discontinuation should be recorded in theCRF and in the source documents.

This is an open-label study; therefore, Compound A is identified on thepackage labeling.

Subjects enrolled in the study are issued an identification card showingthe name of this study and an emergency contact number. This can be usedby health care professionals seeking emergency information about asubject's participation in the study.

The procedures set out in this study protocol pertaining to the conduct,evaluation, and documentation of this study are designed to ensure thatSponsor, its authorized representative, and Investigator abide by GoodClinical Practice (GCP), as described in International Conference onHarmonisation (ICH) Guideline E6 and in accordance with the generalethical principles outlined in the Declaration of Helsinki. The studywill receive approval from an IRB/EC prior to commencement. TheInvestigator conducts all aspects of the study in accordance withapplicable national, state, and local laws of the pertinent regulatoryauthorities.

Investigator responsibilities are set out in the ICH Guideline for GoodClinical Practice and in the local regulations. Staff or an authorizedrepresentative evaluate and approve all Investigators who in turnselects their staff. The Investigator should ensure that all personsassisting with the study are adequately informed about the protocol,amendments, study treatments, as well as study-related duties andfunctions, including obligations of confidentiality of Sponsorinformation. The Investigator should maintain a list ofSub-investigators and other appropriately qualified persons to whom heor she has delegated significant study-related duties. The Investigatoris responsible for keeping a record of all subjects who sign an informedconsent form (ICF) and are screened for entry into the study. Subjectswho fail screening must have the reason(s) recorded in the subject'ssource documents. The Investigator, or a designated member of theInvestigator's staff, must be available during monitoring visits toreview data, resolve queries and allow direct access to subject records(e.g., medical records, office charts, hospital charts, andstudy-related charts) for source data verification. The Investigatormust ensure timely and accurate completion of CRFs and queries.

The Investigator obtains informed consent of a subject and/or asubject's legal representative prior to any study related procedures.Documentation that informed consent occurred prior to the studysubject's entry into the study and of the informed consent processshould be recorded in the study subject's source documents including thedate. The original ICF signed and dated by the study subject and by theperson consenting the study subject prior to the study subject's entryinto the study, must be maintained in the Investigator's study files anda copy given to the study subject. In addition, if a protocol is amendedand it impacts on the content of the informed consent, the ICF must berevised. Study subjects participating in the study when the amendedprotocol is implemented must be re-consented with the revised version ofthe ICF. The revised ICF is signed and dated by the study subject andmust be maintained in the Investigator's study files with a copy givento the study subject.

Any amendment to a study protocol must be approved by the ClinicalResearch Physician/Medical Monitor. Amendments are submitted to theIRB/EC for written approval. Written approval must be obtained beforeimplementation of the amended version occurs. The written signedapproval from the IRB/EC should specifically reference the Investigatorname, protocol number, study title and amendment number(s) that isapplicable. Amendments that are administrative in nature do not requireIRB/IEC approval but will be submitted to the IRB/IEC for informationpurposes.

Before the start of the study, the study protocol, ICF, and any otherappropriate documents is submitted to the IRB/EC with a cover letter ora form listing the documents submitted, their dates of issue, and thesite (or region or area of jurisdiction, as applicable) for whichapproval is sought. If applicable, the documents will also be submittedto the authorities in accordance with local legal requirements.Investigational product can only be supplied to an Investigator bySponsor or its authorized representative after documentation on allethical and legal requirements for starting the study has been receivedby Sponsor or its authorized representative. This documentation mustalso include a list of the members of the IRB/EC and their occupationand qualifications. If the IRB/EC will not disclose the names,occupations and qualifications of the committee members, it should beasked to issue a statement confirming that the composition of thecommittee is in accordance with GCP. For example, the IRB GeneralAssurance Number may be accepted as a substitute for this list. Formalapproval by the IRB/EC should mention the protocol title, number,amendment number (if applicable), study site (or region or area ofjurisdiction, as applicable), and any other documents reviewed. It mustmention the date on which the decision was made and must be officiallysigned by a committee member. Before the first subject is enrolled inthe study, all ethical and legal requirements must be met. The IRB/ECand, if applicable, the authorities, must be informed of all subsequentprotocol amendments in accordance with local legal requirements.Amendments must be evaluated to determine whether formal approval mustbe sought and whether the ICF should also be revised. The Investigatormust keep a record of all communication with the IRB/EC and, ifapplicable, between a Coordinating Investigator and the IRB/EC. Thisstatement also applies to any communication between the Investigator (orCoordinating Investigator, if applicable) and regulatory authorities.

If required by legislation or the IRB/EC, the Investigator must submitto the IRB/EC: Information on serious or unexpected adverse events assoon as possible; Periodic reports on the progress of the study; andDeviations from the protocol or anything that may involve added risk tosubjects.

The Sponsor reserves the right to terminate this study prematurely atany time for reasonable medical or administrative reasons. Any prematurediscontinuation is appropriately documented according to localrequirements (e.g., IRB/EC, regulatory authorities, etc.). In addition,the Investigator or Sponsor has the right to discontinue a single siteat any time during the study for medical or administrative reasons suchas: Unsatisfactory enrollment; GCP noncompliance; Inaccurate orincomplete data collection; Falsification of records; or Failure toadhere to the study protocol.

Regarding data handling and recording, the Investigator must ensure thatthe records and documents pertaining to the conduct of the study and thedistribution of the investigational product are complete, accurate,filed and retained. Examples of source documents include: hospitalrecords; clinic and office charts; laboratory notes; memoranda;subject's diaries or evaluation checklists; dispensing records; recordeddata from automated instruments; copies or transcriptions certifiedafter verification as being accurate copies; microfiche; x-ray film andreports; and records kept at the pharmacy, and the laboratories, as wellas copies of CRFs or CD-ROM.

Data is collected via CRF and entered into the clinical database perSponsor SOPs. This data is verified electronically through use ofprogrammed edit checks specified by the clinical team. Discrepancies inthe data are brought to the attention of the clinical team, andinvestigational site personnel, if necessary. Resolutions to theseissues are reflected in the database. An audit trail within the systemtracks all changes made to the data.

Essential documents must be retained by the Investigator according tothe period of time outlined in the clinical trial agreement. TheInvestigator must retain these documents for the time period describedabove or according to local laws or requirements, whichever is longer.Essential documents include, but are not limited to, the following:Signed ICFs for all subjects; Subject identification code list,screening log (if applicable), and enrollment log; Record of allcommunications between the Investigator and the IRB/EC; Composition ofthe IRB/EC; Record of all communications between the Investigator,Sponsor, and their authorized representative(s); List ofSub-investigators and other appropriately qualified persons to whom theInvestigator has delegated significant study-related duties, togetherwith their roles in the study, curriculum vitae, and their signatures;Copies of CRFs (if paper) and of documentation of corrections for allsubjects; Compound A accountability records; Record of any body fluidsor tissue samples retained; All other source documents (subject records,hospital records, laboratory records, etc.); All other documents aslisted in Section 8 of the ICH consolidated guideline on GCP (EssentialDocuments for the Conduct of a Clinical Trial).

The Investigator must notify the Sponsor if he/she wishes to assign theessential documents to someone else, remove them to another location oris unable to retain them for a specified period. The Investigator mustobtain approval in writing from the Sponsor prior to destruction of anyrecords. If the Investigator is unable to meet this obligation, theInvestigator must ask the Sponsor for permission to make alternativearrangements. Details of these arrangements should be documented. Allstudy documents should be made available if required by relevant healthauthorities. Investigator or institution should take measures to preventaccidental or premature destruction of these documents.

All aspects of the study are monitored carefully by the Sponsor or itsauthorized representative for compliance with applicable governmentregulations with respect to current GCP and SOPs. Sponsor ensures thatappropriate monitoring procedures are performed before, during and afterthe study. All aspects of the study are reviewed with the Investigatorand the staff at a study initiation visit and/or at an Investigators'Meeting. Prior to enrolling subjects into the study, a representativereviews the protocol, CRFs, procedures for obtaining informed consent,record keeping, and reporting of AEs/SAEs with the Investigator.Monitoring includes on-site visits with the Investigator and his/herstaff as well as any appropriate communications by mail, email, fax, ortelephone. During monitoring visits, the facilities, investigationalproduct storage area, CRFs, subject's source documents, and all otherstudy documentation are inspected/reviewed by the Sponsor'srepresentative in accordance with the Study Monitoring Plan.

Accuracy is checked by performing source data verification that is adirect comparison of the entries made onto the CRFs against theappropriate source documentation. Any resulting discrepancies arereviewed with the Investigator and/or his/her staff. Any necessarycorrections will be made directly to the CRFs or via queries by theInvestigator and/or his/her staff. Monitoring procedures require thatinformed consents, adherence to inclusion/exclusion criteria anddocumentation of SAEs and their proper recording be verified.

Additional monitoring activities may be outlined in a study-specificmonitoring plan. In addition to the routine monitoring procedures, aGood Clinical Practice Quality Assurance unit exists within the Sponsor.Representatives of this unit will conduct audits of clinical researchactivities in accordance with Sponsor SOPs to evaluate compliance withGood Clinical Practice guidelines and regulations.

The Investigator is required to permit direct access to the facilitieswhere the study took place, source documents, CRFs and applicablesupporting records of study subject participation for audits andinspections by IRB/ECs, regulatory authorities (e.g., FDA, EMA, HealthCanada) and company authorized representatives. The Investigator shouldmake every effort to be available for the audits or inspections. If theInvestigator is contacted by any regulatory authority regarding aninspection, he/she should contact the Sponsor immediately.

APPENDIX A: ABBREVIATIONS

Abbreviation or Specialist Term Explanation ADA Anti-drug antibodiesADCC Antibody-dependent cellular cytotoxicity ADL Activity of daily lifeAE Adverse event ALL Acute lymphoid leukemia ALT Alanineaminotransferase (SGPT) AML Acute myeloid leukemia ANC Absoluteneutrophil count Ara-C Cytarabine AST Aspartate aminotransferase (SGOT)AUC Area under the curve β-hCG β-subunit of human chorionic gonadotropinBID Twice a day BM Bone marrow BMI Body mass index BSA Body surface areaBUN Blood urea nitrogen C Cycle CBC Complete blood count CD Cluster ofdifferentiation CEBPα CCAAT/enhancer binding protein alpha CI Confidenceinterval c-Kit Mast/stem cell growth factor receptor CL Clearance CmaxMaximum plasma concentration of drug CNS Central nervous system CRComplete remission CRc Cytogenetic complete remission CRi Completeremission with incomplete neutrophil recovery CRp Complete remissionwith incomplete platelet recovery CRP C-reactive protein CRR Completeremission rate CRO Contract research organization CRF Case report formCRP Clinical Research Physician CRS Clinical Research Scientist CRTCalreticulin CT Computed tomography CTCAE Common Terminology Criteriafor Adverse Events CV % Coefficient of variation DAT Direct antiglobulintest DCR Disease control rate DIC Disseminated intravascular coagulationDLT Dose-limiting toxicity DMC Data Monitoring Committee DOR Duration ofresponse EC Ethics Committee ECG Electrocardiogram ECHO EchocardiogramECOG PS Eastern Cooperative Oncology Group Performance Status eCRFElectronic case report form EEA European Economic Area ELISAEnzyme-linked immunoassay EOI End of infusion EOT End of treatment ESRErythrocyte sedimentation rate FACS Fluorescence-activated cell sortingFCBP Females of child bearing potential FCBP Females of child bearingpotential FDA Food and Drug Administration FISH Fluorescence in situhybridization FLT3 Fms-related tyrosine kinase 3 FLT3-ITD Fms-relatedtyrosine kinase 3-internal tandem duplication FOXP3 Forkhead box P3 GCPGood Clinical Practice GVHD Graft-versus-host disease HBV Hepatitis Bvirus HCV Hepatitis C virus HGB Hemoglobin HIV Human immunodeficiencyvirus HLA Human leukocyte antigen HNSTD Highest non-severely toxic doseHSCT Hematopoietic stem cell transplant huCD Human cluster ofdifferentiation ICD Informed consent document ICF Informed consent formICH International Conference on Harmonisation ICSH International Councilfor Standardization in Hematology IFN Interferon IgE Immunoglobulin Esubclass IgG Immunoglobulin G subclass IL Interleukin IL-1βInterleukin-1 beta IND Investigational New Drug INR Internationalnormalized ratio IP Investigational Product IPSS-R Revised InternationalPrognostic Index Scoring System IRB Institutional Review Board IRRInfusion related reaction IRT Integrated Response Technology IVIntravenous IVIG Intravenous immunoglobulin IWG International workinggroup KC-GRO Keratinocyte-derived cytokine-growth-regulated oncogene LDHLactate dehydrogenase LSC Leukemia stem cell LVEF Left ventricularejection fraction mCR Molecular complete remission MCP-1 Monocytechemoattractant protein-1 MDR Multi-drug resistance MDS Myelodysplasticsyndrome MedDRA Medical Dictionary for Regulatory Activities MIP-1αMacrophage inflammatory protein-1 alpha MM Multiple myeloma MRI Magneticresonance imaging MTD Maximum tolerated dose MUGA Multi-gatedacquisition N Number NCI National Cancer Institute NHL Non-Hodgkin'slymphoma NOD-SCID Non-obese diabetic, severe-combine immunodeficiencyNOAEL No observed adverse effect level NOEL No observed effect levelNPM1 Nucleophosmin 1 NSG Non-obese diabetic, severe-combineimmunodeficiency γ NTD Non-tolerated dose O2 Oxygen ORR Objectiveresponse rate OS Overall survival PBMC Peripheral blood mononuclearcells PCR Polymerase ch PD Pharmacodynamic PFS Progression-free survivalPK Pharmacokinetics PLT Platelet PR Partial remission PT Prothrombintime PTT Partial thromboplastin time Q2W Every two weeks QD Once a dayQW Once weekly QWx2 Once a week for two weeks QWx4 Once a week for fourweeks RAEB Refractory anemia with excess blasts RBC Red blood cell countRFS Relapse free survival RP2D Recommended Phase 2 dose SAE Seriousadverse event SAP Statistical analysis plan SC Steering committee SDStandard deviation SE Standard error SGOT Serum glutamic oxaloacetictransaminase SGPT Serum glutamic pyruvic transaminase SIRPαSignal-regulatory protein alpha SOP Standard operating procedure SRCSafety review committee SUSAR Suspected unexpected serious adversereaction t_(1/2) Half-life t_(max) Time to peak plasma concentration TLSTumor lysis syndrome TNBC Triple-negative breast cancer TNFα Tumornecrosis factor alpha ULN Upper limit of normal US United States USPUnited States Pharmacopeia V_(SS) Volume of distribution WBC White bloodcell count WHO World Health Organization Wks Weeks

APPENDIX B: RECIST VERSION 1.1

The following information is extracted/summarized from Eisenhauer, 2009,New Response Evaluation Criteria in Solid Tumors: Revised RECISTGuideline (Version 1.1). Please refer to the primary reference forfurther information.

DEFINITIONS

At screening, tumor lesions/lymph nodes are categorized as measurable ornon-measurable.

Measurable Disease

Tumor Lesions. Must be accurately measured in at least one dimension(longest diameter in the plane of measurement is to be recorded) with aminimum size of: (a) 10 mm by CT scan (CT scan slice thickness nogreater than 5 mm); (b) 10 mm caliper measurement by clinical exam(lesions which cannot be accurately measured with calipers should berecorded as non-measurable); and (c) 20 mm by chest X-ray.

Malignant Lymph Nodes

To be considered pathologically enlarged and measurable, a lymph nodemust be ≥15 mm in short axis when assessed by CT scan (CT scan slicethickness recommended to be no greater than 5 mm). At baseline and infollow-up, only the short axis will be measured and followed.

Non-Measurable Disease

All other lesions, including small lesions (longest diameter <10 mm orpathological lymph nodes with ≥10 to <15 mm short axis) as well as trulynon-measurable lesions. Lesions considered truly non-measurable include:leptomeningeal disease, ascites, pleural or pericardial effusion,inflammatory breast disease, lymphangitic involvement of skin or lung,abdominal masses/abdominal organomegaly identified by physical exam thatis not measurable by reproducible imaging techniques.

Tumor Response Evaluation

Target lesions: When more than one measurable tumor lesion is present atbaseline all lesions up to a maximum of five lesions total (and amaximum of 2 lesions per organ) representative of all involved organsshould be identified as target lesions and will be recorded and measuredat baseline. Target lesions should be selected on the basis of theirsize (lesions with the longest diameter), be representative of allinvolved organs, but in addition should be those that lend themselves toreproducible repeated measurements. Note that pathological nodes mustmeet the measurable criterion of a short axis of ≥15 mm by CT scan andonly the short axis of these nodes will contribute to the baseline sum.All other pathological nodes (those with short axis ≥10 mm but <15 mm)should be considered non-target lesions. Nodes that have a short axis<10 mm are considered non-pathological and should not be recorded orfollowed. At baseline, the sum of the target lesions (longest diameterof tumor lesions plus short axis of lymph nodes: overall maximum of 5)is to be recorded.

After baseline, a value should be provided on the eCRF for allidentified target lesions for each assessment, even if very small. Ifextremely small and faint lesions cannot be accurately measured but aredeemed to be present, a default value of 5 mm may be used. If lesionsare too small to measure and indeed are believed to be absent, a defaultvalue of 0 mm may be used.

Non-target lesions: All non-measurable lesions (or sites of disease)plus any measurable lesions over and above those listed as targetlesions are considered non-target lesions. Measurements are not requiredbut these lesions should be noted at baseline and should be followed as“present,” “absent,” or “unequivocal progression.”

Response Criteria: Target and non-target lesions are evaluated forresponse separately, and then the tumor burden as a whole is evaluatedas the overall response:

Target Lesion Response:

-   -   Target lesions are assessed as follows: (1) Complete Response        (CR). Disappearance of all target lesions. Any pathological        lymph nodes (whether target or non-target) must have reduction        in short axis to <10 mm; (2) Partial Response (PR). At least a        30% decrease in the sum of diameters of target lesions, taking        as reference the baseline sum diameters; (3) Progressive Disease        (PD). At least a 20% increase in the sum of diameters of target        lesions, taking as reference the smallest sum on study (this        includes the baseline sum if that is the smallest on study). In        addition to the relative increase of 20%, the sum must also        demonstrate an absolute increase of at least 5 mm. (Note: the        appearance of one or more new lesions is also considered        progression); and (4) Stable Disease (SD). Neither sufficient        shrinkage to qualify for PR nor sufficient increase to qualify        for PD, taking as reference the smallest sum of diameters while        on study.

Non-Target Lesion Response:

-   -   Non-target lesions will be assessed as follows: (1) Complete        Response (CR).

Disappearance of all non-target lesions and normalization of tumormarker level. All lymph nodes must be non-pathological in size (<10 mmshort axis); (2) NonCR/Non-PD. Persistence of one or more non-targetlesion(s) and/or maintenance of tumor marker level above the normallimits; and (3) Progressive Disease (PD). Unequivocal progression (seecomments below) of existing non-target lesions. (Note: the appearance ofone or more new lesions is also considered progression).

When the Subject Also Has Measurable Disease: In this setting, toachieve “unequivocal progression” on the basis of the non-targetdisease, there must be an overall level of substantial worsening innon-target disease such that, even in presence of SD or PR in targetdisease, the overall tumor burden has increased sufficiently to meritdiscontinuation of therapy. A modest “increase” in the size of one ormore non-target lesions is usually not sufficient to quality forunequivocal progression status. The designation of overall progressionsolely on the basis of change in non-target disease in the face of SD orPR of target disease is therefore be extremely rare.

When the Subject Has Only Non-measurable Disease: This circumstancearises in some Phase 3 trials when it is not a criterion of study entryto have measurable disease. The same general concepts apply here asnoted above; however, in this instance there is no measurable diseaseassessment to factor into the interpretation of an increase innon-measurable disease burden. Because worsening in non-target diseasecannot be easily quantified (by definition: if all lesions are trulynon-measurable) a useful test that can be applied when assessingsubjects for unequivocal progression is to consider if the increase inoverall disease burden based on the change in non-measurable disease iscomparable in magnitude to the increase that would be required todeclare PD for measurable disease: i.e., an increase in tumor burdenrepresenting an additional 73% increase in “volume” (which is equivalentto a 20% increase diameter in a measurable lesion). Examples include anincrease in a pleural effusion from “trace” to “large,” an increase inlymphangitic disease from localized to widespread, or may be describedin protocols as “sufficient to require a change in therapy.” If“unequivocal progression” is seen, the subject should be considered tohave had overall PD at that point. Although it is ideal to haveobjective criteria to apply to non-measurable disease, the very natureof that disease makes it impossible to do so: therefore, the increasemust be substantial.

Overall response should be assessed according to Table 7 for subjectswith target lesions, and Table 8 for subjects with only non-targetlesions:

TABLE 7 Time Point Response: Subjects with Target (±Non-target) DiseaseTarget Non-target New Overall Lesions Response Lesion Response LesionsResponse CR CR No CR CR Non-CR/non-PD No PR CR Not evaluated No PR PRNon-PD or not all evaluated No PR SD Non-PD or not all evaluated No SDNot all evaluated Non-PD No NE PD Any Yes or No PD Any PD Yes or No PDAny Any Yes PD CR = complete response, PR = partial response, SD =stable disease, PD = progressive disease, NE = inevaluable.

TABLE 8 Time Point Response: Subjects with Non-target Disease OnlyNontarget Lesions Response New Lesions Overall Response CR No CRNon-CR/non-PD No Non-CR/non-PDa Not all evaluated No NE Unequivocal PDYes or No PD Any Yes PD CR = complete response, PR = partial response,SD = stable disease, PD = progressive disease, NE = inevaluable.aNon-CR/non-PD” is preferred over “stable disease” for nontarget diseasesince SD is increasingly used as endpoint for assessment of efficacy insome trials so to assign this category when no lesions can be measuredis not advised.Symptomatic Deterioration

Subjects with a global deterioration of health status requiringdiscontinuation of treatment without objective evidence of diseaseprogression at that time should be reported as “symptomaticdeterioration.” Every effort should be made to document objectiveprogression even after discontinuation of treatment. Symptomaticdeterioration is not a descriptor of an objective response: it is areason for stopping study therapy. The objective response status of suchsubjects is to be determined by evaluation of target and non-targetdisease.

APPENDIX C: REVISED RESPONSE CRITERIA FOR MALIGNANT LYMPHOMA

International Working Group Revised Response Criteria for MalignantLymphoma (Cheson, 2007) can be accessed online at the “jco.” “ascopubs”“.org” website using the specic URL “/cgi/reprint/25/5/579” (click on“manual download for full text PDF of manuscript).

APPENDIX D: PERFORMANCE STATUS CRITERIA

TABLE 9 Eastern Cooperative Oncology Group (ECOG) Performance Status(see Oken, 1982) Score Description 0 Fully active, able to carry on allpre-disease performance without restriction 1 Restricted in physicallystrenuous activity but ambulatory and able to carry out work of a lightor sedentary nature, e.g., light housework, office work. 2 Ambulatoryand capable of all self-care but unable to carry out any workactivities. Up and about more than 50% of waking hours. 3 Capable ofonly limited self-care, confined to bed or chair more than 50% of wakinghours. 4 Completely disabled. Cannot carry on any self-care. Totallyconfined to bed or chair 5 Dead

APPENDIX E: GENERAL GUIDELINES FOR MANAGING HYPERGLYCEMIA

Fasting glucose is defined as a level monitored ≥4 hr from the last mealfor assessment of dose-limiting toxicity and clinical managementdecisions. Subjects should be instructed on how to recognize hypo- andhyperglycemia. Any subject who experiences hyperglycemia or symptomsassociated with hyperglycemia is managed per standard of care withCompound A interruptions/reductions. Additional guidelines are describedbelow: (a) In the event of persistent fasting hyperglycemia (>126 mg/dLor 14 mmol/L), or more or equal to Grade 2 or at any time consideredappropriate by the Investigator, it is recommended that treatment withan oral anti-diabetic agent (OAD) be initiated; (b) In the event ofGrade ≥3 fasting hyperglycemia, monitoring in the clinic should occuruntil the hyperglycemia resolves to Grade ≤2; (c) In the event ofpersistent Grade 3 fasting hyperglycemia (>250 mg/dL or 27.8 mmol/L),insulin therapy is considered either in conjunction with an OAD oralone. Long-acting insulin is used only when the subject ishospitalized. Monitoring of glucose continues for at least 6 hrfollowing administration of insulin (fast-or long-acting) due topossible rebound effects. The medical monitor is notified; (d) In theevent of a Grade 4 fasting blood glucose (>50 mg/dL or 27.8 mmol/L),Compound A is withheld while insulin therapy is initiated. The medicalmonitor is notified. Treatment interruptions of >4 weeks necessitatesremoval of the subject from this study; and (e) At the discretion of theInvestigator, daily home monitoring via finger-stick testing (whilefasting in the AM) may be initiated. Subjects are provided a glucometerand trained how to perform finger-stick testing and document results ina diary card which is reviewed during each clinic visit. They areinstructed how to contact study staff immediately in the event of a highfasting glucose result (>160 mg/dL or 8.9 mmol/L), in which case promptassessment in the clinic is necessary; or call clinic and specify inclinic visit if grade 3 or higher. The opinion of an endocrinologistregarding adequate management of the subject may be advisable in suchcases.

Glucophage, and other biguanide therapy, should be temporarily suspendedwhen planned radiological tumor assessments (e.g., CT scan) involvesiodinated contrast. Goldberg, 2005; and Turina, 2006 are suggestedresources for hyperglycemia management.

APPENDIX G: MANAGEMENT OF BIOLOGIC SPECIMENS (ADDENDUM TO LABORATORYMANUAL)

Sample Handling and Storage: All blood and tissue samples collected forbiomarker and genetic research as part of this study that are notdepleted following analysis will be stored for use in research for up to5 yrs after the study is completed. With subject consent, the storageperiod will be extended to 20 yrs after the study is completed for usein future research to learn more about cancer and other diseases.Samples are stored in a secure laboratory facility designed for longterm sample storage, with appropriate access control, monitoring andback-up systems.

Sample Coding: All biomarker and genetic research samples will beidentified only by a code (subject identification number). These sampleswill not have any other personal information on them. The study doctorkeeps the code key. The samples and the code key are kept confidentialand separate. Researchers who perform tests on samples see only the codeand do not see any information that specifically identifies the subject.

Research on Blood & Tissue Samples: Biomarker and genetic researchsamples are tested by the sponsor or by companies contracted by thesponsor to determine the effects Compound A has on the subject andsubject's cancer. This includes determining if biomarkers in blood cellsor tumor cells demonstrate that Compound A is biologically active.Additionally, DNA samples from whole blood and tumor tissue are analyzedfor genetic changes that may correlate with the subject's response tothe drug.

Reporting and Availability of Biomarker and Genetic Results: Biomarkerand genetic research sample test results are not shared with thesubject, insurance companies, nor any other third parties not involvedin the sample analysis described above. The results are not filed in thesubject's medical records. Test results are for research purposes onlyand are not used to make decisions about a subject's routine medicalcare.

Names of subjects and identifiers will not be mentioned in publicationsor reports, thereby minimizing the possibility of psychological orsocial risks that could arise from knowledge of this biomarker andgenetic information, such as risk for employability or insurability orthe risk of discrimination.

Mechanism to Request Sample Destruction upon Withdrawal of Consent: Ifsubjects withdraw consent to participate in the study, they mayadditionally request to have their biomarker and genetic researchsamples destroyed. In such cases, a subject informs the study doctorthat consent has been withdrawn and request to have any stored, unusedsamples destroyed. Any unused samples will then be destroyed by thesponsor. If samples were analyzed before consent was withdrawn, however,then the sponsor may still use data already available.

If subjects agree to allow biomarker and genetic research samples to bekept 20 yrs for future research, they are also free to reverse just thatdecision at any time. The subject will inform the study doctor thatpermission has been withdrawn for samples to be used for futureresearch. Any unused samples will then be destroyed by the sponsor. Ifsamples were analyzed before consent was withdrawn, however, then thesponsor may still use data already available.

APPENDIX H: CHARACTERISTICS OF THE BAYESIAN LOGISTIC REGRESSION MODEL

An adaptive Bayesian logistic regression model (BLRM, Neuenschwander, etal., 2008) for dose escalation with overdose control (EWOC, Babb et al1988) may be used to guide dose escalation in this study.

This Appendix presents performance metrics (operating characteristics)that illustrate the precision of the design in estimating the MTD undervarious dose-toxicity relationships through computer simulation. Inaddition, recommendations of the next dose level by BLRM withoverdose-control principle are provided under various hypotheticaloutcome scenarios in early cohorts (assuming three evaluable patients ineach cohort for simplicity) to show how it facilitates on-studydose-escalation decisions.

Regarding specifications and results of simulation study, operatingcharacteristics that illustrate the precision of the design inestimating the MTD under various assumed true dose-toxicityrelationships can be envisioned. Simulations (see FIG. 6) are performedfor the BLRM under five scenarios of true dose-DLT relationship: (a)Dose-DLT relationship is a steep curve and MTD is reached at early doselevel (SE); (b) Dose-DLT relationship is a steep curve and MTD isreached at middle dose level (SM); (c) Dose-DLT relationship is a steepcurve and MTD is reached at late dose level (SL); (d) Dose-DLTrelationship is a flat curve and MTD is reached at middle dose level(FM); and (e) Dose-DLT relationship is a flat curve and MTD is reachedat late dose level (FL)

TABLE 10 P(DLT) for five simulated scenarios P(DLT) at different doselevel (mg) Scenario 15 30 60 90 120 150 180 200 SE 0.0879 0.1647 0.28740.3800 0.4520 0.5094 0.5563 0.5829 SM 0.0015 0.008 0.0418 0.1045 0.19010.2874 0.3857 0.4478 SL 0.000 0.0004 0.0049 0.0224 0.0635 0.1362 0.23890.3184 FM 0.0295 0.0677 0.1477 0.2239 0.2928 0.3539 0.4079 0.4402 FL0.0026 0.0106 0.0428 0.0935 0.1574 0.2284 0.3013 0.3490

Operating characteristics are reviewed to investigate overallperformance of the BLRM under each true scenario. Table 11 summarizesthe results from the simulations performed:

TABLE 11 Summary metrics of simulation for BLRM and comparison with 3 +3 Probability of Proportion recommending a dose Scenario/ Mean # ofsubjects with true P(DLT) Method subjects with DLT 0.16-0.33 ≥0.33 <0.16SE, N-CRM 20.14 0.23 0.73 0.13 0.15 SE, 3 + 3 15.35 0.23 0.60 0.11 0.29SM, N-CRM 24.20 0.13 0.68 0.10 0.22 SM, 3 + 3 23.76 0.13 0.53 0.12 0.35SL, N-CRM 26.33 0.10 0.53 0.00 0.47 SL, 3 + 3 26.81 0.09 0.51 0.00 0.49FM, N-CRM 22.90 0.16 0.51 0.11 0.38 FM, 3 + 3 20.26 0.17 0.39 0.12 0.49FL, N-CRM 25.13 0.12 0.48 0.14 0.47 FL, 3 + 3 24.77 0.12 0.42 0.11 0.53

Overall the BLRM model with specified prior is performing reasonably.With similar or a little more sample size, BLRM model can select MTD inthe target range with higher probability, especially for scenarios (a),(b), and (d).

Regarding the hypothetical dose escalation scenarios in early cohorts,aside from the overall operating characteristics studied above, thedesign should make reasonable decisions during a study based on theobserved toxicities. After completion of a given cohort, the decision todose escalate and actual dose chosen for the subsequent cohort willdepend on the recommendation of the BLRM per EWOC principle and medicalreview of available clinical and laboratory data.

Some scenarios to illustrate the dose escalation up to the third dosecohort are listed in Table 12 using the 2-parameter BLRM. It is assumedthat each cohort has at least 3 evaluable patients. If any patientexperiences a DLT, the dose increase will be no greater than 50% for anysubsequent dose escalation. The BLRM model is performing reasonably forthe hypothetical dose escalation scenarios.

TABLE 12 Possible scenarios up to the third cohort with three patientsper cohort Dose #DLT/ Next dose Scenario History (mg) #Pat by N-CRM (mg)1 15 0/3 30 2 15 0/3 30 30 0/3 60 3 15 0/3 30 30 1/3 30 4 15 0/3 30 302/3 15 5 15 0/3 30 30 0/3 60 60 0/3 90 6 15 0/3 30 30 0/3 60 60 1/3 60

The Bayesian Logistic Regression Model enables us to incorporate thepre-clinical information, as well as to update the recommended dosebased on all safety data in the study. By reviewing the metricspresented in the table, it can be seen that the model is not sensitiveto different scenarios of truth. In general, this model is conservativedue to the overdose control criteria. In all scenarios, theprobabilities of recommending a dose with true P(DLT)≥33% as MTD aremuch smaller than probabilities of recommending a dose with true P(DLT)between 16%-33% as MTD.

On-study recommendations based on the model are consistent with theclinical decision making process, and should be considered inconjunction with other available clinical information by the SponsorClinical Trial Team and Study investigators in deciding the dose levelsto be tested in order to determine the MTD.

Example 13. Synergistic Effects of Compound a and Histone Deacetylase(HDAC) Inhibitor Romidepsin in a Pancreatic Xenograft PA0165 Mouse Mode

The BET Bromodomain Protein BRD4 has been implicated in the regulationof the metabolic pathways in the pancreas. The expression of BRD4 issignificantly upregulated in pancreatic ductal adenocarcinoma celllines, compared to that in human pancreatic duct epithelial cells.Furthermore, studies show that BRD4 promotes pancreatic ductaladenocarcinoma cell proliferation and enhances resistance to somechemotherapeutic agents, such as gemcitabine. Therefore, BRD4 inhibitionhas promise for pancreatic cancer treatments. This led to an efficacy invivo experiment to understand whether Compound A-mediated BRD4inhibition could sensitize the pancreatic tumor cells to the treatmentof HDAC inhibitor Romidepsin.

Cohorts of 4-6 wk-old NSG mice bearing PA0165 were treated withRomidepsin at 1.5 mg/kg intravenous (IV)×3 Q4D; Compound A 25 mg/kgorally QD 3 days on then 4 days off; or with a combination of Compound A25 mg/kg orally QD 3 days on then 4 days off and Romidepsin at 1.5 or0.75 mg/kg IV Q7D. The treatment lasted 21 days. Significant tumorgrowth inhibitions, as measured by tumor volumes, were observed for alltreatment groups (FIG. 8). Romidepsin alone induced significant TGI of45%. Compound A alone induced significant TGI of 38%. The combination ofCompound A and Romidepsin demonstrated synergy, and was significantlysuperior to all other regimens in terms of TGI (68% with Compound A incombination with 1.5 mg/kg Romidepsin; 65% with Compound A incombination with 0.75 mg/kg Romidepsin).

All treatment groups lost substantial weight between day 10 and day 15,and then recovered. Compound A only or combination treatment groupsdisplay significantly greater survival rate than the Romidepsin onlytreatment group (FIG. 9). At day 30 following initial treatment, thesurvival rate for the Romidepsin only treatment group was about 10%. Incontrast, the survival rates for the Compound A only or combinationtreatment groups were about 70%. There was no significant difference inthe survival rate between the Compound A only and combination treatmentgroups.

Example 14. Synergistic Effects of Compound a and Abraxane(Protein-Bound Paclitaxel) in a Pancreatic Xenograft PA0165 Mouse Model

The BET Bromodomain Protein BRD4 has been implicated in the regulationof the metabolic pathways in the pancreas. The expression of BRD4 issignificantly upregulated in pancreatic ductal adenocarcinoma celllines, compared to that in human pancreatic duct epithelial cells.Furthermore, studies show that BRD4 promotes pancreatic ductaladenocarcinoma cell proliferation and enhances resistance to somechemotherapeutic agents, such as gemcitabine. Therefore, BRD4 inhibitionhas promise for pancreatic cancer treatments. This led to an efficacy invivo experiment to understand whether Compound A-mediated BRD4inhibition could sensitize the pancreatic tumor cells to the treatmentof protein-bound paclitaxel Abraxane.

Cohorts of NSG mice bearing PA0165 were treated with Abraxane 10 mg/kg,IV×3 Q4D; Compound A 25 mg/kg orally QD 3 days on then 4 days off; orwith a combination of Abraxane 10 mg/kg iv Q7D and Compound A 25 or 12.5mg/kg orally QD 3 days on then 4 days off. The treatment lasted 21 days.Significant tumor growth inhibitions, as measured by tumor volumes, wereobserved for all treatment groups (FIG. 10). Abraxane alone inducedsignificant TGI of 55%. Compound A alone induced significant TGIs of49.3%. The combination of Compound A and Abraxane demonstrated synergy,and was significantly superior to all other regimens in terms of TGI(78.1% with Abraxane in combination with 25 mg/kg Compound A; 79.1% withAbraxane in combination with 12.5 mg/kg Compound A). Moderate weightloss was observed during part of the study course in all groups; Bodyweight loss observed in larger tumor bearing mic. The combinationtreatment groups displayed significantly greater survival rates comparedto the individual treatment groups (FIG. 11). At day 41 following theinitial treatment, the survival rate for Abraxane only treatment groupwas 0% and for Compound A only treatment group was about 20%. Incontrast, the survival rate for the combination groups was about 60%with the treatment of Abraxane in combination with 25 mg/kg Compound Aand 70% with Abraxane in combination with 12.5 mg/kg Compound A,respectively.

We claim:
 1. A method for treating cancer or neoplastic diseasecomprising administering to a human patient a therapeutically effectiveamount of (i) at least one bromodomain and extra-terminal protein (BET)inhibitor and (ii) at least one chemotherapeutic agent, which does notinhibit BET directly, wherein the BET inhibitor has the structure ofFormula I, or a pharmaceutically acceptable salt thereof,

wherein: R² is CH₃, CH₂CH₃, CH₂CF₃, CH₂F, CHF₂, CF₃, CH₂D, CHD₂, or CD₃;X⁵ is C—R⁵, wherein: R⁵ is hydrogen, halogen, OH, CN, OR⁶¹, NHR⁶¹,N(R⁶¹)₂, alkyl, cycloalkyl, cycloalkylalkyl, aryl, aralkyl,heterocyclyl, heterocyclylalkyl, heteroaryl, or heteroarylalkyl, inwhich each R⁶¹ is independently selected from alkyl, cycloalkyl,cycloalkylalkyl, aryl, aralkyl, heterocyclyl, heterocyclylalkyl,heteroaryl, or heteroarylalkyl; X⁶ is C—R⁶, wherein: R⁶ is hydrogen,halogen, OH, CN, alkyl, cycloalkyl, cycloalkylalkyl, amino, alkylamino,dialkylamino, cycloalkylalkylamino, alkoxy, or cycloalkylalkoxy; X⁷ isC—R⁷, wherein: R⁷ is hydrogen, halogen, OH, CN, OR⁶¹, NHR⁶¹, N(R⁶¹)₂,alkyl, cycloalkyl, cycloalkylalkyl, aryl, aralkyl, heterocyclyl,heterocyclylalkyl, heteroaryl, or heteroarylalkyl; X⁸ is C—R⁸, whereinR⁸ is hydrogen, halogen, or alkyl; and R^(A) is

wherein: X² is or C—R¹², wherein R¹² is hydrogen, halogen, alkyl, oralkoxy; R¹³ is Y—Z, wherein Y is selected from a bond, CH₂, CH(C₁-C₄alkyl); and Z is selected from SO₂R²¹, N(R²²)SO₂R²¹, SO₂N(R²²)₂,N(R²²)SO₂N(R²²)₂, CON(R²²)₂, N(R²²)CO₂R²¹, N(R²²)CON(R²²)₂, N(R²²)COR²¹,COR²¹, OC(O)N(R²²)₂, OSO₂N(R²²)₂, or N(R²²)SO₃R²¹; wherein each R²¹ isindependently selected from alkyl, cycloalkyl, cycloalkylalkyl, aryl,aralkyl, heterocyclyl, heterocyclylalkyl, heteroaryl, orheteroarylalkyl; and each R²² is independently selected from hydrogen,alkyl, cycloalkyl, cycloalkylalkyl, aryl, aralkyl, heterocyclyl,heterocyclylalkyl, heteroaryl, or heteroarylalkyl; X³ is C—R¹⁴, whereinR¹⁴ is hydrogen, halogen, —CN, alkyl, cycloalkyl, or alkoxy; and X⁴ isC—R¹⁵, wherein R¹⁵ is hydrogen, halogen, alkyl, CN, or alkoxy; and R¹⁶is hydrogen, halogen, or W—X, wherein W is a bond, O, or S, and X isselected from alkyl, aryl, aralkyl, cycloalkyl, cyclo-alkylalkyl,alkynyl, cycloalkylalkynyl, heterocyclyl, heterocyclylalkyl, heteroarylor heteroarylalkyl; wherein the chemotherapeutic agent is selected fromthe group consisting of temozolomide, romidepsin, and protein-boundpaclitaxel, and wherein the BET inhibitor is present in an amount toenhance the therapeutic effect of the chemotherapeutic agent.
 2. Themethod of claim 1, wherein administering the BET inhibitor and thechemotherapeutic agent results in a synergistic reduction in cellproliferation in a tumor of the patient or a synergistic increase inapoptosis in a tumor of the patient as compared with administration ofeither the BET inhibitor or the chemotherapeutic agent alone.
 3. Themethod of claim 1, wherein the therapeutic effective amount for both theBET inhibitor and chemotherapeutic agent when administered together canbe at least 50% lower than when the BET inhibitor and chemotherapeuticagent are used individually.
 4. The method of claim 1, wherein thechemotherapeutic agent is temozolomide.
 5. The method of claim 1,wherein the cancer or neoplastic disease is glioblastoma.
 6. The methodof claim 1, wherein the cancer is temozolomide-resistant.